Psalm 21:1

“No sooner do they rise from the baptismal font, and by being born again and incorporated into our Lord and Saviour thus fulfil what is written of them,“Blessed are they whose iniquities are forgiven and whose sins are covered,” than at the first communion of the body of Christ they say, “Forgive us our debts,”…” — editor's note: Ps. xxi. 1.

““O Lord, the King shall rejoice in Thy strength” (ver. 1).” — the author cites it