These are they that were numbered of the Levites— For the same reasons for which the other tribes were registered, it was fit that this of Levi should be registered in like manner, under the three chief branches of that sacred order, distinguished chap. Numbers 3:17-18. But, as they were not to inherit with other tribes, they are numbered by themselves. It appears from chap. Numbers 3:39 that they were considerably increased.
Related Commentaries of Numbers 26:57
Numbers 26:57
57 And these are they that were numbered of the Levites after their families: of Gershon, the family of the Gershonites: of Kohath, the family of the Kohathites: of Merari, the family of the Merarites.