Galatians 3:19

What then is [the benefit of] the law of Moses? It was introduced [as part of God's revelation] in order to define what sin was, until the seed [i.e., Jesus] would come, to whom the promise [of never ending life] was made. The law of Moses was ordained through [the medium of] angels and [delivered] through the hand of an intermediary [i.e., Moses].

Acts 7:53

You received the law that was ordained through [the medium of] angels [See Gal. 3:19] and yet have not obeyed its requirements."

Galatians 3:16

Now [specific] promises were made to Abraham and to his seed [i.e., descendants]. [God] did not say "seeds" [plural] as though He were referring to many persons but "seed" [singular] showing that He meant one [descendant]; [Gen. 13:15 says] "And to your seed," referring to Christ.

Romans 7:7-13

What shall we say then? Is the law of Moses sinful? Certainly not! For I would not have known what sin was if it had not been for the law. For [example]; I would not have known [what it meant] to covet [i.e., have a strong desire for what belongs to someone else] except that the law said [Ex. 20:17], "You must not covet."

Hebrews 2:2

For if the message spoken through angels proved to be binding [Note: This is a reference to the law of Moses. See Acts 7:53; Gal. 3:19], and every violation [of it] and disobedience [to it] received a just penalty,

Acts 7:38

This is the man who was with our forefathers and with the assembly [of Hebrews] in the wilderness [after] the angel had spoken to him at Mt. Sinai. He [is the one] who received the living messages [from God at Mt. Sinai] and gave them to us.

Romans 4:15

For the law brings [God's] wrath [i.e., because of man's failure to obey it perfectly], but where there is no law, there is no [responsibility for] sin.

Luke 16:31

And Abraham replied, 'If they will not listen to Moses and the prophets, neither will they be persuaded [even] if someone rises from the dead [i.e., to come back and warn them].'"

John 1:17

For the law was given through Moses; [but] God's favor and truth came through Jesus Christ.

John 5:45-47

"Do not think that I will accuse you [of wrongdoing] before the Father; Moses, on whom you have set your hope [i.e., you base your acceptance with God on the promises found in Moses' writings], he is the one who accuses you [i.e., in his writings].

John 15:22

They would not be guilty of sinning if I had not come and spoken to them. But now [that I have], they have no excuse for their sin.

Romans 2:13

For [it is] not those who hear the law of Moses who are right with God, but [it is] those who obey [the requirements of] that law [perfectly] who will be considered right with God.

Romans 3:1-2

What advantage then does the Jew have [i.e., over the Gentile]? Or what value is there in circumcision?

Romans 3:19-20

Now we [all] know that everything the law says applies to those who are under [obligation to obey] that law, [Note: Here "the law" appears to refer to the Old Testament Scriptures generally, since Psalms and Isaiah are quoted. See verses 10-18]. This is so that the mouth of every objector may be stopped [i.e., from making excuses for his sin], and thereby bring the entire world under God's judgment [i.e., both Jews and Gentiles].

Romans 5:20-21

Now the law of Moses was introduced [into the world] in order to cause sin to increase [i.e., it defined many things to be wrong that were previously not regarded as sin]. But with the increase of sin, God's unearned favor increased all the more.

Galatians 3:21-25

Is the law of Moses contrary to the promises of God? Certainly not! For if there had been a law given which could provide [never ending] life, then a person could be considered right with God by [obeying the requirements of such] a law.

Galatians 4:1-4

But as long as the person who has an inheritance coming to him is a child, he is really no better off than a slave, even though he himself is [rightfully] entitled [to the inheritance].

1 Timothy 1:8-9

But we know that the law of Moses is good if a person uses it properly.

Hebrews 2:5

For God did not place the coming inhabited world [Note: "The coming inhabited world" here probably refers to the present Christian age. It was viewed as "coming" from the perspective of Old Testament times], under the control of angels [and] that is the world we are talking about.

Treasury of Scripture Knowledge

Summary

Wherefore then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made; and it was ordained by angels in the hand of a mediator.

Bible References

Then

Romans 3:1
What advantage then does the Jew have [i.e., over the Gentile]? Or what value is there in circumcision?
Romans 7:7
What shall we say then? Is the law of Moses sinful? Certainly not! For I would not have known what sin was if it had not been for the law. For [example]; I would not have known [what it meant] to covet [i.e., have a strong desire for what belongs to someone else] except that the law said [Ex. 20:17], "You must not covet."

It was added

Galatians 3:21
Is the law of Moses contrary to the promises of God? Certainly not! For if there had been a law given which could provide [never ending] life, then a person could be considered right with God by [obeying the requirements of such] a law.
Luke 16:31
And Abraham replied, 'If they will not listen to Moses and the prophets, neither will they be persuaded [even] if someone rises from the dead [i.e., to come back and warn them].'"
John 5:45
"Do not think that I will accuse you [of wrongdoing] before the Father; Moses, on whom you have set your hope [i.e., you base your acceptance with God on the promises found in Moses' writings], he is the one who accuses you [i.e., in his writings].
John 15:22
They would not be guilty of sinning if I had not come and spoken to them. But now [that I have], they have no excuse for their sin.
Romans 2:13
For [it is] not those who hear the law of Moses who are right with God, but [it is] those who obey [the requirements of] that law [perfectly] who will be considered right with God.
Romans 3:19
Now we [all] know that everything the law says applies to those who are under [obligation to obey] that law, [Note: Here "the law" appears to refer to the Old Testament Scriptures generally, since Psalms and Isaiah are quoted. See verses 10-18]. This is so that the mouth of every objector may be stopped [i.e., from making excuses for his sin], and thereby bring the entire world under God's judgment [i.e., both Jews and Gentiles].
Romans 4:15
For the law brings [God's] wrath [i.e., because of man's failure to obey it perfectly], but where there is no law, there is no [responsibility for] sin.
Romans 5:20
Now the law of Moses was introduced [into the world] in order to cause sin to increase [i.e., it defined many things to be wrong that were previously not regarded as sin]. But with the increase of sin, God's unearned favor increased all the more.
Romans 7:7
What shall we say then? Is the law of Moses sinful? Certainly not! For I would not have known what sin was if it had not been for the law. For [example]; I would not have known [what it meant] to covet [i.e., have a strong desire for what belongs to someone else] except that the law said [Ex. 20:17], "You must not covet."
1 Timothy 1:8
But we know that the law of Moses is good if a person uses it properly.

Till

Galatians 3:16
Now [specific] promises were made to Abraham and to his seed [i.e., descendants]. [God] did not say "seeds" [plural] as though He were referring to many persons but "seed" [singular] showing that He meant one [descendant]; [Gen. 13:15 says] "And to your seed," referring to Christ.
Galatians 4:1
But as long as the person who has an inheritance coming to him is a child, he is really no better off than a slave, even though he himself is [rightfully] entitled [to the inheritance].

By

Acts 7:53
You received the law that was ordained through [the medium of] angels [See Gal. 3:19] and yet have not obeyed its requirements."
Hebrews 2:2
For if the message spoken through angels proved to be binding [Note: This is a reference to the law of Moses. See Acts 7:53; Gal. 3:19], and every violation [of it] and disobedience [to it] received a just penalty,