Role in Religious Texts:
Since Zadkiel is the angel of mercy, Jewish tradition identifies Zadkiel as the "angel of the Lord" mentioned in Genesis chapter 22 of the Torah and the Bible, when the prophet Abraham is proving his faith to God by preparing to sacrifice his son Isaac and God has mercy on him. However, Christians believe that the angel of the Lord is actually God himself, appearing in angelic form. Verses 11 and 12 record that, right at the moment when Abraham picked up a knife to sacrifice his son to God: "...the angel of the Lord called out to him from heaven, 'Abraham! Abraham!' 'Here I am,' he replied. 'Do not lay a hand on the boy,' he said. 'Do not do anything to him. Now I know that you fear God, because you have not withheld from me your son, your only son.'
In verses 15 through 18, after God has provided a ram to sacrifice instead of the boy, Zadkiel calls out from heaven again: "The angel of the Lord called to Abraham from heaven a second time and said, 'I swear by myself, declares the Lord, that because you have done this and have not withheld your son, your only son, I will surely bless you and make your descendants as numerous as the stars in the sky and as the sand on the seashore. Your descendants will take possession of the cities of their enemies, and through your offspring all nations on earth will be blessed, because you have obeyed me.'"
The Zohar, the holy book of the mystical branch of Judaism called Kabbalah, names Zadkiel as one of two archangels (the other is Jophiel), who help the archangel Michael when he fights evil in the spiritual realm.