John Calvin Commentary Exodus 15:27

"And they came to Elim, where were twelve springs of water, and threescore and ten palm-trees: and they encamped there by the waters." — Exodus 15:27 (ASV)

And they came to Elim. Moses here relates that a more pleasant station was granted to the people, when they were led to a well-watered spot, even planted with palm-trees, which do not usually grow in a dry soil. But we learn from what precedes, that this was a concession to their infirmity, because they had endured their thirst so impatiently.