Titus 1:9

holding fast the faithful Word according to the doctrine, that he may be able, by sound doctrine, both to exhort and to convict the gainsayers.

1 Timothy 1:10

for fornicators, for homosexuals, for slave-traders, for liars, for perjurers, and anything else that is contrary to sound doctrine,

2 Thessalonians 2:15

Therefore, my brothers, stand fast and hold the teachings which you have been taught, whether by word or by our letter.

1 Timothy 6:3

If anyone teaches otherwise, and does not consent to wholesome words (those of our Lord Jesus Christ), and to the doctrine according to godliness,

2 Timothy 1:13

Hold fast the pattern of sound words which you have heard from me, in faith and love which is in Christ Jesus.

1 Timothy 1:15

Faithful is the Word and worthy of all acceptance, that Christ Jesus came into the world to save sinners, of whom I am chief.

Titus 2:1

But you speak the things which become sound doctrine:

Job 2:3

And Jehovah said unto Satan, Have you set your heart on My servant Job, that there is none like him in the earth, a perfect and an upright man, one who fears God and turns away from evil? And still he is keeping hold of his integrity, although you moved Me against him to destroy him without cause.

Job 27:6

I hold fast by my righteousness, and I will not let it go; my heart shall not shame me any of my days.

Proverbs 23:23

Buy the truth, and sell it not; also wisdom, and instruction, and understanding.

Acts 18:28

For he mightily confuted the Jews publicly, proving by the Scriptures that Jesus was the Christ.

1 Corinthians 14:24

But if all prophesy, and some unbeliever or one not instructed comes, he is convicted by all, he is judged by all.

1 Thessalonians 5:21

Prove all things, hold fast to the good.

1 Timothy 1:19

holding faith and a good conscience, which some have put away and made shipwreck as to faith.

1 Timothy 4:9

Faithful is the Word, and worthy of all acceptance.

2 Timothy 2:2

And the things that you have heard from me among many witnesses, commit the same to faithful men who will be able to teach others also.

2 Timothy 2:25

in meekness instructing those who oppose, if perhaps God will give them repentance to the acknowledging of the truth,

2 Timothy 4:3

For a time will be when they will not endure sound doctrine, but they will heap up teachers to themselves according to their own lusts, tickling the ear.

Titus 1:11

whose mouth you must stop, who subvert whole houses, teaching things not right for the sake of ill gain.

Titus 2:7-8

In all things having shown yourself a pattern of good works: in the doctrine, purity, sensibleness, without corruption,

Jude 1:3

Having made all haste to write to you about the common salvation, beloved, I had need to write to you to exhort you to contend earnestly for the faith once delivered to the saints.

Revelation 2:25

But that which you have, hold fast until I come.

Revelation 3:3

Remember then how you have received and heard, and hold fast, and repent. Therefore if you will not watch, I will come upon you as a thief, and you will not know what hour I will come upon you.

Revelation 3:11

Behold, I come quickly. Hold fast to that which you have, so that no one may take your crown.

Treasury of Scripture Knowledge

Summary

Holding fast the faithful word as he hath been taught, that he may be able by sound doctrine both to exhort and to convince the gainsayers.

Bible References

Fast

1 Timothy 1:15
Faithful is the Word and worthy of all acceptance, that Christ Jesus came into the world to save sinners, of whom I am chief.
1 Timothy 4:9
Faithful is the Word, and worthy of all acceptance.
1 Timothy 6:3
If anyone teaches otherwise, and does not consent to wholesome words (those of our Lord Jesus Christ), and to the doctrine according to godliness,
2 Timothy 2:2
And the things that you have heard from me among many witnesses, commit the same to faithful men who will be able to teach others also.

Sound

Titus 2:1
But you speak the things which become sound doctrine:
1 Timothy 1:10
for fornicators, for homosexuals, for slave-traders, for liars, for perjurers, and anything else that is contrary to sound doctrine,
1 Timothy 6:3
If anyone teaches otherwise, and does not consent to wholesome words (those of our Lord Jesus Christ), and to the doctrine according to godliness,
2 Timothy 4:3
For a time will be when they will not endure sound doctrine, but they will heap up teachers to themselves according to their own lusts, tickling the ear.

To convince

Titus 1:11
whose mouth you must stop, who subvert whole houses, teaching things not right for the sake of ill gain.
Acts 18:28
For he mightily confuted the Jews publicly, proving by the Scriptures that Jesus was the Christ.
1 Corinthians 14:24
But if all prophesy, and some unbeliever or one not instructed comes, he is convicted by all, he is judged by all.
2 Timothy 2:25
in meekness instructing those who oppose, if perhaps God will give them repentance to the acknowledging of the truth,

General references

Leviticus 14:42
And they shall take other stones and put them in the place of those stones. And he shall take other mortar and shall plaster the house.
Leviticus 15:8
And if he who issues spits on him that is clean, then he shall wash his clothes, and bathe in water, and be unclean until the evening.
Ezekiel 44:9
So says the Lord Jehovah: No son of an alien, uncircumcised of heart and uncircumcised of flesh, shall enter into My sanctuary, or any son of an alien among the sons of Israel.
Haggai 2:11
So says Jehovah of Hosts: Now ask the priests the Law, saying,
Titus 2:1
But you speak the things which become sound doctrine: