QUESTION
Where in the Bible did God appear as an angel?
ANSWER
I am not aware of any place where God appeared as an angel. Below is part of an article on angels in the OT from Dictionary of Paul and His Letters
Angels in the OT and Judaism.
Although angels are frequently called “sent ones” in the OT, they may also be referred to as “holy ones,” “sons of gods,” “sons of God,” “hosts,” “ministers,” or in certain instances they may be given the title “commander,” Josh 5:14. Angels in the OT appear as messengers or representatives of the heavenly world, frequently sent by Yahweh himself. They are part of the created order and serve God’s purposes, assisting and carrying out important transactions between God and humans, but primarily between God and Israel. They mediate revelation (2 Kings 1:3), come to the assistance of individuals (Gen 16:9), are associated with manifestations of Yahweh (Gen 18; 32:1), serve as part of the heavenly council (Ps 89:6-9) and make up the heavenly army (Deut 33:2; Zech 1:11). An angel is sent to accompany and direct Israel through the wilderness journey (cf. Ex 23:23 and Ex 33:2), and an angel brings judgment against Jerusalem (2 Sam 24:16). In visionary and apocalyptic settings angels take on more distinct roles as manlike figures who guide the seer within visions and serve as interpreters (Ezek 40:3; Zech 1:7-17). In Daniel angels take on a variety of roles, the most notable being that of the great archangel Michael, the protector of Israel (Dan 10:13; 12:1).The title “angel of the Lord” seems to refer to an angel of rank or stature who carries out special missions for Yahweh. Such an angel appears to Moses in the flaming bush (Ex 3:2), leads Israel out of Egypt and into the land of promise (cf. Josh 5:13-15 and Judg 2:1-5) and appears to Gideon (Judg 6:11) at an hour of crisis.
Jewish texts outside of the OT testify to an expanded understanding of the nature and role of angels in some sectors of Second Temple Judaism. Much of this was simply an extension and development of what was to be found in the OT. Angels protect individuals (1 Enoch 100:5), execute judgment (1 Enoch 56:1-8), act as heavenly scribes (Jub 1:27-29), populate the heavenly court (1 Enoch 14:18-24), take part in the heavenly liturgy (1 Enoch 61:9-13; 4Q400-407), come to the aid of Israel in warfare (3 Macc 6:18-21), are differentiated by rank and name (1 Enoch 61:10; 2 Enoch 20; T. Levi 3), and guide heavenly visions and interpret mysteries (1 Enoch 17-36). One notable new development is the notion of two opposing forces of angelic powers: a force of good angels led by God or an archangel, and a force of evil angels led by an evil angelic power known as Satan, Mastema or Belial.
