“Each at his banner, with the insignias of their patrilineal houses, the children of Israel shall encamp; at a distance, around the Tent of Meeting, they shall encamp” (Numbers 2:2). “Each at his banner…,” that is what is written: “We will sing with joy at your salvation and raise banners in the name of our God…” (Psalms 20:6). Israel said before the Holy One blessed be He: ‘We are singing with joy at Your salvation, what You have done on our behalf in Your name’ – “we will sing with joy at Your salvation.”
“The Lord saved [vayosha] Israel on that day” (Exodus 14:30). Vayivasha is written,1The letters of vayosha (saved somebody else) are the same as the letters of vayivasha (was himself saved). as it were, Israel is saved and it is as though He was saved. “And raise banners in the name of our God,” as the Holy One blessed be He affixed His name to ours and arranged us according to banners, as it is stated: “Each at his banner.”