This often omitted, but rich stanza of John Newton's great hymn would be a great prayer for preparing our souls for communion with God in the means of grace in the company of the saints. I especially love the line "Wash our souls and songs with blood."
Hark! the Name of Jesus, sounded
Loud, from golden harps above!
Lord, we blush, and are confounded,
Faint our praises, cold our love!
Wash our souls and songs with blood,
For by Thee we come to God.