Before: These three tribes, in the wilderness, marched immediately after the ark and cherubim, by Divine appointment, to which this appears to be an allusion. Numbers 2:18-24, Numbers 10:22-24
stir up: Psalms 35:23, Psalms 44:23-26, Psalms 78:38; Isaiah 42:13-14
come and save us: Heb. come for salvation to us, Isaiah 25:9, Isaiah 33:22