Cross reference
2 Timothy 4:15
15 of whom also do thou beware, for greatly hath he stood against our words;
2 Timothy 3:8
8 and, even as Jannes and Jambres stood against Moses, so also these do stand against the truth, men corrupted in mind, disapproved concerning the faith;
Matthew 10:16-17
16 `Lo, I do send you forth as sheep in the midst of wolves, be ye therefore wise as the serpents, and simple as the doves.
17 And, take ye heed of men, for they will give you up to sanhedrims, and in their synagogues they will scourge you,
Philippians 3:2
2 look to the dogs, look to the evil-workers, look to the concision;