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. Num 2:18-24, Num 10:22-24
stir up: Psa 35:23, Psa 44:23-26, Psa 78:38; Isa 42:13-14
come and save us: Heb. come for salvation to us, Isa 25:9, Isa 33:22