Leviticus 21:2-3

21:2 except for his close relative who is near to him: his mother, his father, his son, his daughter, his brother, 21:3 and his virgin sister who is near to him, who has no husband; he may defile himself for her.

Leviticus 10:3

10:3 Moses then said to Aaron, “This is what the Lord spoke: ‘Among the ones close to me I will show myself holy, and in the presence of all the people I will be honored.’” So Aaron kept silent.

Leviticus 25:25

25:25 “‘If your brother becomes impoverished and sells some of his property, his near redeemer is to come to you and redeem what his brother sold.