The role of angels in prayer is taught explicitly in the Jewish book of Tobit (Tob. 12:12), which was accepted by Christians as inspired until
Luther rejected some of the Jewish scriptures on his own authority. It remains part of the Catholic Bible. “I can now tell you that when you, Tobit, and Sarah prayed, it was I who presented and read the record of your prayer before the Glory of the Lord; and I did the same thing when you used to bury the dead” (Tobit 12:12; note that God pays attention to our
good works).