Leasing lez'-ing (kazabh "to devise," "to fabricate," hence, "to lie"; occurs but twice in the King James Version (Psalms 4:2, the Revised Version (British and American) "falsehood"; 5:6, the Revised Version (British and American) "lies"); the Hebrew word is translated "liars" (Psalms 116:11); "lie" or deceive (Job 6:28)): The idea of treachery, lying, and deceit, lies at the root of this word. Joab's conduct is a good illustration of the meaning (2 Samuel 3:27, 2 Samuel 20:8-10). In Psalms 5:6 David is referring to the cunning, treachery, and falsehood of his adversaries; compare 2 Samuel 13:28, 2 Samuel 15:7-9. Doubtless David had a special person in mind as being guilty of "leasing," probably Ahithophel.
William Evans