Leviticus 21:2

New American Bible - revised edition

except for his nearest relatives, his mother or father, his son or daughter, his brother

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None of you shall approach a close relative to have sexual intercourse. I am the Lord.

nor shall he go near any dead person. Not even for his father or mother may he thus become unclean;

or his unmarried sister, who is of his own family while she remains single; for these he may make himself unclean.

We do not want you to be unaware, brothers, about those who have fallen asleep, so that you may not grieve like the rest, who have no hope.