When they went out of Egypt, Moses said ‘and the cloud of God was on them by day’ (Numbers 10:34); and when they went out of Jerusalem, Jeremiah said ‘[You have screened Yourself off] with a cloud, that no prayer may pass through.’ (Lamentations 3:44)
When They Went Out of Egypt, Moses on the Cloud of God Was on Them by
Yalkut Shimoni on Nach 1026:13