Leviticus 19:3
19:3 Each of you must respect his mother and his father, and you must keep my Sabbaths. I am the Lord your God.
Leviticus 21:2
21:2 except for his close relative who is near to him: his mother, his father, his son, his daughter, his brother,
Leviticus 21:11
21:11 He must not go where there is any dead person; he must not defile himself even for his father and his mother.