Acts 2:40
And with many more appeals he solemnly warned and entreated them, saying, "Escape from this crooked generation."
Acts 18:5-6
Now at the time when Silas and Timothy came down from Macedonia, Paul was preaching fervently and was solemnly telling the Jews that Jesus is the Christ.
Acts 20:21
and urging upon both Jews and Greeks the necessity of turning to God and of believing in Jesus our Lord.
Ephesians 4:17
Therefore I warn you, and I implore you in the name of the Master, no longer to live as the Gentiles in their perverseness live,
1 Thessalonians 4:6
and that in this matter there be no encroaching on the rights of a brother Christian and no overreaching him. For the Lord is an avenger in all such cases, as we have already taught you and solemnly warned you.