23 and, when they came in towards Marah, they could not drink the waters of Marah, for they were, bitter,––for this cause, was the name thereof called Marah.
Exodus 15:23 Cross References - Rotherham
Numbers 33:8
8 And they brake up from before Hahiroth, and passed through the midst of the sea, towards the desert,––and went their way a journey of three days, in the desert of Etham, and encamped in Marah.
Ruth 1:20
20 And she said unto them, Do not call me Naomi[=" Sweet"], ––call me Mara[=" Bitter"], for the Almighty hath dealt very bitterly with me: