'Boastest' in the Bible

{To the chief Musician: an instruction. Of David; when Doeg the Edomite came and told Saul, and said unto him, David came to the house of Ahimelech.} Why boastest thou thyself in evil, thou mighty man? The loving-kindness of God abideth 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?