Exodus 13:15-17

Young's Literal Translation

¹⁵ yea, it cometh to pass, when Pharaoh hath been pained to send us away, that Jehovah doth slay every first-born in the land of Egypt, from the first-born of man even unto the first-born of beast; therefore I am sacrificing to Jehovah all opening a womb who [are] males, and every first-born of my sons I ransom;

¹⁶ and it hath been for a token on thy hand, and for frontlets between thine eyes, for by strength of hand hath Jehovah brought us out of Egypt.'

¹⁷ And it cometh to pass in Pharaoh's sending the people away, that God hath not led them the way of the land of the Philistines, for it [is] near; for God said, `Lest the people repent in their seeing war, and have turned back towards Egypt;'