The Angel Who Said I Change My Form Every Hour

Yalkut Shimoni on Nach 69:1

"And the angel of the LORD said to Manoah" (Judges 13:18). The angel said to him: I do not know in whose likeness I am made, for at every hour He changes me. "Why do you ask my name, seeing it is wondrous?" (Judges 13:18) Wonders of wonders He works through me: sometimes I am wind, as it is said, "He makes His messengers winds" (Psalms 104:4); sometimes I am fire, as it is said, "His ministers a flaming fire" (Psalms 104:4). And so you find with Abraham: they appeared to him as men, "And he lifted up his eyes and looked, and behold, three men" (Genesis 18:2). And at Sodom they appeared as angels, "And the two angels came to Sodom" (Genesis 19:1).

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