Cross reference
Numbers 26:59
59 Amram's wife was Jochebed, the daughter of Levi, whom he had in Egypt: by Amram she had Moses and Aaron and their sister Miriam.
Exodus 6:20
20 And Amram took Jochebed, his father's sister, as wife; and she gave birth to Aaron and Moses: and the years of Amram's life were a hundred and thirty-seven.
Exodus 2:1-2
1 Now a man of the house of Levi took as his wife a daughter of Levi.
2 And she became with child and gave birth to a Son; and when she saw that he was a beautiful child, she kept him secretly for three months.
Leviticus 18:12
12 You may not have sex connection with your father's sister, for she is your father's near relation.