26 As soon as Joab had left David, he sent messengers after Abner, who brought him back from the well of Sirah; but David was unaware of it.
2 Samuel 3:26 Cross References - BSB
Proverbs 26:23-26
23 Like glaze covering an earthen vessel are burning lips and a wicked heart.
24 A hateful man disguises himself with his speech, but he lays up deceit in his heart.
25 When he speaks graciously, do not believe him, for seven abominations fill his heart.
26 Though his hatred is concealed by deception, his wickedness will be exposed in the assembly.