Reference for Psalms 68:17

Some Biblical descriptions of historical events, such as the exodus from Egypt and the giving of the Torah, Rabbi Jose raised to great poetic heights. Expounding the verse, “why do you skip on wrinkled hills,” (Psalms, 68:17) he said: “When God was ready to give the Torah from Mount Sinai, the other mountains skipped about in confusion. They argued among themselves and each one claimed the honor of having God give the Torah to the Jews from its top.”