Charles Ellicott Commentary Psalms 114:4

"The mountains skipped like rams, The little hills like lambs." — Psalms 114:4 (ASV)

Skipped. —The Hebrew word translated this way is translated “dance” in Ecclesiastes 3:4. (See Psalms 18:7.)Exodus 19:18 was no doubt in the poet’s thought, but the leaping of the hills formed part of every theophany.