Leviticus 21:1-2 New King James Version (NKJV)

1. And the Lord said to Moses, “Speak to the priests, the sons of Aaron, and say to them: ‘None shall defile himself for the dead among his people,

2. except for his relatives who are nearest to him: his mother, his father, his son, his daughter, and his brother;

Leviticus 21