Revelation 22:18-19
"I solemnly declare to every one who hears the words of the prophecy contained in this book, that if any one adds to those words, God will add to him the plagues spoken of in this book;
Acts 2:40
And with many more appeals he solemnly warned and entreated them, saying, "Escape from this crooked generation."
Acts 20:21
and urging upon both Jews and Greeks the necessity of turning to God and of believing in Jesus our Lord.
Galatians 5:3
I once more protest to every man who receives circumcision that he is under obligation to obey the whole Law of Moses.
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.