Exodus 15:23

Young's Literal Translation 1898

and they come in to Marah, and have not been able to drink the waters of Marah, for they [are] bitter; therefore hath [one] called its name Marah.

Cross References

Numbers 33:8

And they journey from Pi-Hahiroth, and pass over through the midst of the sea, into the wilderness, and go a journey of three days in the wilderness of Etham, and encamp in Marah.

Ruth 1:20

And she saith unto them, ‘Call me not Naomi; call me Mara, for the Almighty hath dealt very bitterly to me,