were the angels created?
Jochanan: 0n the second day, since it is written, "Who layest the
beams of Thine upper chambers in the waters. . . Who makest winds Thy
messengers, the flaming fire Thy ministers."
R. Hanina: On the fifth day, since it is written, "winged things
flying, above the earth,"  and "with two wings he (i.e.,
the seraph) flew."
All agree they were
not created on the first day, so that people should not say that Michael
stretched the south end of the firmament and Gabriel the north end.
about the creation of angels is to be found in the conversation between
the Emperor Hadrian and R. Joshua b. Hananiah:
you maintain that a band of ministering angels do not offer praise to
God more than once, and He daily creates a fresh band who sing before
Him and then perish?
R. Joshua: That is so.
Emperor: Where do they go?
R. Joshua: To the place where they were created.
Emperor: Whence are they created?
R. Joshua: From the river fire.
Emperor: What is the nature of the river of fire?
R. Joshua: It is like the Jordan, which does not cease its flow day or
Emperor: Whence does it originate?
R. Joshua: From the perspiration of the Hayyot which they exude
while carrying the Throne of the Holy One, blessed be He.
 Genesis 1:30
 Isaiah 6:2
 Genesis Rabbah 1:3
 Genesis Rabbah 78:1