'Behind' in the Bible

The families of the Gershonites shall pitch behind the tabernacle westward.

Now two men had remained in camp. One was named Eldad and the other was named Medad. When the spirit rested on them, since they were among those who were listed but had not gone out to the tent, they stayed behind and prophesied in the camp.

But you with your sons will keep your priesthood to perform your priestly duties for everything at the altar and for {the area behind the curtain}. I give you the priesthood as a gift, but the stranger who approaches will be put to death."