Psalm 51 is the 51st psalm of the Book of Psalms, in English known by its first verse in the King James Version, "Have mercy upon me, O God".In the Greek Septuagint version of the bible, and the Latin Vulgate, this psalm is Psalm 50 in a slightly different numbering system. Logos.ReferenceTagging.tag(); _uacct = "UA-159744-1"; Saul had suffered such a fate for his continuing rebellion against Yahweh. In Israel, the priest sprinkled animal blood on the altar with a hyssop branch. Since he had sinned with a high hand, in rebellious defiance of Yahweh and in repudiation of the terms of His covenant, his sentence was death ( Numbers 15:30-31; cf. But, though he fell, he was not utterly cast down, for God graciously upheld him and raised him up. If God would wash David morally, he would be thoroughly clean. To the leader. God had promised to protect David from death. Psalm 51.