In Psalm 51:2, David pleads for thorough washing from sin, echoing Peter's desire for complete cleansing to belong to Jesus.

1 Peter 3:21 clarifies that baptism saves not by removing bodily dirt but by a good conscience—contrasting Peter's literal request for full washing with the spiritual reality.

Hebrews 10:22 combines heart sprinkling and body washing, mirroring Peter's wish for total cleansing—both refer to approaching God with full purity.

Psalm 51:7 echoes Peter's plea for thorough cleansing—David's cry for inner washing parallels Peter's desire for full external washing, though David's is spiritual.