Purifications or Baptisms used by the Devout Before Entering God's House
Source: TTT
Psalm 26:6
I wash my hands in innocence that I may go about Your altar, O LORD,
Hebrews 10:22
let us draw near with a sincere heart in full assurance of faith, having our hearts sprinkled to cleanse us from a guilty conscience and our bodies washed with pure water.