Parallel
Exodus 15:23
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
And when they came to Marah (note: that is, Bitterness), they could not drink of the waters of Marah, for they were bitter: therefore the name of it was called Marah.
And when they came to Marah (note: Marah means bitter.), they could not drink the water there because it was bitter. (That is why it was named Marah.)