Albert Barnes Commentary Psalms 105:41

"He opened the rock, and waters gushed out; They ran in the dry places [like] a river." — Psalms 105:41 (ASV)

He opened the rock ... - See the notes at (Psalms 78:15). They ran in the dry places like a river. Or, a river. They flowed along in the desert—a river of waters. See the notes at (1 Corinthians 10:4).