Hebrews 12:20
For those people could not stand [hearing] the command [Ex. 19:12f], "If even an animal touches the mountain, it must be stoned [to death]."
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].
Galatians 2:19
For it was by means of [this system of] law-keeping that I [realized I] was dead. This was so I could find life through a relationship with God.
Galatians 3:10
For all who seek to be right with God by trying to meet all the requirements of the law of Moses are under a curse [from God], because it is written [Deut. 27:26], "Every person is cursed [i.e., cut off from God] who does not continue to obey all of the requirements written in the law of Moses."