2 Peter
In his first letter Peter feeds Christ's sheep by instructing them how to deal with persecution from outside the church; in this second letter he teaches them how to deal with false teachers and evildoers who have come into the church.
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But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things,
and bring all things to your remembrance, whatsoever I have said unto you. John 14:26