Before Ephraim and Benjamin and Manasseh stir up thy strength, and come and save us.
Before Ephraim and Benjamin and Manasseh - i:e., advancing at their head, as formerly thou didst advance in the pillar of cloud and of fire before Israel marching through the wilderness. In Numbers 2:17-24 Ephraim Manasseh, and Benjamin are represented as occupying the foremost place after the ark. Therefore they are joined here.
Stir up thy strength - I which now seems to slumber (Psalms 78:65).
And come and save us - Hebrew, 'come for salvation to us.'