"And they departedª° from beforeª¹ Pihahiroth,ª and passed throughª° the midstª of the seaª into the wilderness,ª and went²°¹ threeª days'ª journeyª in the wildernessª of Etham,ª and pitchedª° in Marah.ª" {Num 33:8}
Marah:
i.e. bitterness, "And she saidª° unto¹ them, Callª° me not¹Naomi,ª callª° me Mara:ª for¹ the Almightyª hath dealt very² bitterlyª°¹ with me." {Rth 1:20}