Bible Verses About Defilement: Mourning for the dead

The Lord said also to Moses: Speak to the priests the sons of Aaron, and thou shalt say for them: Let not a priest incur an uncleanness at the death of his citizens.

But only for his kin, such as are near in blood: that is to say, for his father and for his mother, and for his son, and for his daughter, for his brother also:

And for a maiden sister, who hath had no husband.