Jesus refers to Peter by the name he used when he met him because He is trying to get Peter’s attention
John 1:42 (NASB95) — 42 He brought him to Jesus. Jesus looked at him and said, “You are Simon the son of John; you shall be called Cephas” (which is translated Peter).
David ps 51
Psalm 51:10–14 (NASB95) — 10 Create in me a clean heart, O God, And renew a steadfast spirit within me. 11 Do not cast me away from Your presence And do not take Your Holy Spirit from me. 12 Restore to me the joy of Your salvation And sustain me with a willing spirit. 13 Then I will teach transgressors Your ways, And sinners will be converted to You. 14 Deliver me from bloodguiltiness, O God, the God of my salvation; Then my tongue will joyfully sing of Your righteousness.
