THE COURSE OF THE MOON RABBAN JOCHANAN BEN ẒAKKAI, Rabban Gamaliel, R. Ishmael, R. Elazar ben 'Arakh, R. Eliezer ben Hyrḳanos, and R. 'Aḳiba were expounding (the laws of) the Molad of the moon. They said: The Holy One, blessed be He, spake one word and the heavens were created as the residence of the Throne of His Glory, as it is said, "By the word of the Lord were the heavens made" (Ps. 33:6). But in connection with the (creation of the) host of heaven He laboured with great labour. || What did the Holy One, blessed be He, do? He blew with His mouth the wind of the breath of life and all the host of heaven were created, as it is said, "And all the host of them by the breath of his mouth" (ibid.).
Birth of Rabban Gamaliel
Pirkei DeRabbi Eliezer 7:1