Cross reference
2 Samuel 3:26
26 And when Joab was come out from David, he sent messengers after Abner, which brought him again from the well of Sirah: but David knew it not.
Proverbs 26:23-26
23 Burning lips and a wicked heart are like a potsherd covered with silver dross.
24 He that hateth dissembleth with his lips, and layeth up deceit within him;
25 When he speaketh fair, believe him not: for there are seven abominations in his heart.
26 Whose hatred is covered by deceit, his wickedness shall be shewed before the whole congregation.
Proverbs 27:4-6
4 Wrath is cruel, and anger is outrageous; but who is able to stand before envy?
5 Open rebuke is better than secret love.
6 Faithful are the wounds of a friend; but the kisses of an enemy are deceitful.