1 Corinthians 9:20
To the Jews I became like a Jew to gain the Jews. To those under the law I became like one under the law (though I myself am not under the law) to gain those under the law.
Acts 16:3
Paul wanted Timothy to accompany him, and he took him and circumcised him because of the Jews who were in those places, for they all knew that his father was Greek.
Acts 21:20-26
When they heard this, they praised God. Then they said to him, "You see, brother, how many thousands of Jews there are who have believed, and they are all ardent observers of the law.
Acts 17:2-3
Paul went to the Jews in the synagogue, as he customarily did, and on three Sabbath days he addressed them from the scriptures,
Acts 18:18
Paul, after staying many more days in Corinth, said farewell to the brothers and sailed away to Syria accompanied by Priscilla and Aquila. He had his hair cut off at Cenchrea because he had made a vow.
Romans 3:19
Now we know that whatever the law says, it says to those who are under the law, so that every mouth may be silenced and the whole world may be held accountable to God.
Romans 6:14-15
For sin will have no mastery over you, because you are not under law but under grace.
Romans 11:14
if somehow I could provoke my people to jealousy and save some of them.
Galatians 4:5
to redeem those who were under the law, so that we may be adopted as sons with full rights.
Galatians 4:21
Tell me, you who want to be under the law, do you not understand the law?
Galatians 5:18
But if you are led by the Spirit, you are not under the law.