Albert Barnes Commentary Judges 15:19

"But God clave the hollow place that is in Lehi, and there came water thereout; and when he had drunk, his spirit came again, and he revived: wherefore the name thereof was called En-hakkore, which is in Lehi, unto this day." — Judges 15:19 (ASV)

A hollow place that was in the jaw - The right translation is, “the hollow place which is in Lehi.” The word translated “hollow place” means a “mortar” (Proverbs 27:22), and is here evidently a hollow or basin among the cliffs of Lehi, which, from its shape, was called “the mortar.” A spring, on the way from Socho to Eleutheropolis, was commonly called Samson’s spring in the time of Jerome and writers in the 7th, 12th, and 14th centuries.