Sifrei Devarim 314

¹(Devarim, Ibid . 11) "As an eagle wakes its nest": Just as an eagle does not enter its nest immediately until it flutters its wings between one tree and another, between one booth and another, until its young awake and have the strength to mount it, so, when the L-rd revealed Himself to give the Torah to Israel, He did not reveal Himself to them (suddenly) from one side, but from four, as it is written ( Ibid . 33:2) "The L-rd came from Sinai and shone forth from Seir to them. He appeared from Mount Paran." And which is the fourth side? ( Habakkuk 3:3) "G-d came from Teman." ²"spreading its wings and taking them" (upon them): as it is written (Devarim 1:31) "and in the desert, where you saw how the L-rd your G-d bore you." ³"bearing them on its pinion": as it is written (Shemoth 19:4) "and I bore you on eagles' wings." ⁴Variantly: "as an eagle wakes its nest": in time to come, viz. (Song of Songs 2:8) "The voice of my Beloved — behold He is coming" (to redeem me). ⁵"spreading its wings": viz. (Isaiah 43:6) "I will say to the North "Give (My exiles) etc." ⁶"bearing them on its pinion": ( Ibid . 49:22) "and they will bring your sons in (their) bosom."