'Boastest' in the Bible

{To the chief Musician, Maschil, A Psalm of David, when Doeg the Edomite came and told Saul, and said unto him, David is come to the house of Ahimelech.} Why boastest thou thyself in mischief, O mighty man? the goodness of God endureth continually.

thou who boastest in law, dost thou by transgression of the law dishonour God?

For who makes thee to differ? and what hast thou which thou hast not received? but if also thou hast received, why boastest thou as not receiving?