Matthew Poole and continuators on Exodus 2:1

1 AND there went a man of the house of Levi , and took to wife a daughter of Levi .

From the place of his abode to another place for the following purpose.

viz. Amram, Exod. 6. 20. Numb. 26. 58, 59.

Namely Iochebed, Numb. 26. 59. called a daughter not strictly but more largely, to wit, a grandchild, as the words father and Son are oft used for a grandfather and a grandson, as hath been shewed before. And so the word sister, Exod. 6. 20. is to be taken largely, as brother is oft used for a cousin. This seems more probable, than that an Israelite should marry his own sister, which even heathens by the light of nature have condemned, especially now when he had such abundant choice elsewhere.

Marginal references: 1 Chron. 23.13.