Variantly: "The chariots of Pharaoh, etc." They (the Egyptians [i.e., Pharaoh') said (Ibid. 1:22) "Every son that is born into the Nile shall you thrown him, You, likewise, meted it out to him accordingly, viz.: "The chariots of Pharaoh, etc."
The Chariots of Pharaoh, Etc
Mekhilta Tractate Shirah 4:15