Numbers 3:35
And the chief of the fathers' house of the clans of Merari was Zuriel the son of Abihail. They were to camp on the north side of the tabernacle.
Numbers 1:53
But the Levites shall camp around the tabernacle of the testimony, so that there may be no wrath on the congregation of the people of Israel. And the Levites shall keep guard over the tabernacle of the testimony."
Numbers 2:25
"On the north side shall be the standard of the camp of Dan by their companies, the chief of the people of Dan being Ahiezer the son of Ammishaddai,
Numbers 3:28-29
According to the number of all the males, from a month old and upward, there were 8,600, keeping guard over the sanctuary.