But those that encamp before the tabernacle on the east, even before the tabernacle of meeting eastward, shall be Moses, and Aaron and his sons, keeping the charge of the sanctuary to meet the needs of the children of Israel; and the stranger that comes near shall be put to death.
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George Leo Haydock
Sons, the children of Aaron. Those of Moses were among the Levites, 1 Paralipomenon xxiii. 13. They did not remain with their father.
In the Hebrew, "to guard the", in order to supply for the rest of the Israelites, ver. 9. (St. Augustine, q. 4.)