2 Timothy 4:15

Do you also, be on your guard against him, for he is strongly opposed to our teaching.

Matthew 10:16-17

Remember, I am sending you out as my Messengers like sheep among wolves. So be as wise as serpents, and as blameless as doves.

Philippians 3:2

Beware of those 'dogs'! Beware of those mischievous workers! Beware of the men who mutilate themselves!

2 Timothy 3:8

Just as Jannes and Jambres opposed Moses, so do these people, in their turn, oppose the Truth. Their minds are corrupted, and, as regards the Faith, they are utterly worthless.

Treasury of Scripture Knowledge

Summary

Of whom be thou ware also; for he hath greatly withstood our words.

Bible References

Be

Matthew 10:16
Remember, I am sending you out as my Messengers like sheep among wolves. So be as wise as serpents, and as blameless as doves.
Philippians 3:2
Beware of those 'dogs'! Beware of those mischievous workers! Beware of the men who mutilate themselves!