וְאֶל־מֵ֣ת אָדָ֔ם לֹ֥א יָב֖וֹא לְטָמְאָ֑ה כִּ֣י אִם־לְאָ֡ב וּ֠לְאֵם וּלְבֵ֨ן וּלְבַ֜ת לְאָ֗ח וּלְאָח֛וֹת אֲשֶֽׁר־לֹא־הָיְתָ֥ה לְאִ֖ישׁ יִטַּמָּֽאוּ׃
And they shall come near no dead person to defile themselves; but for father, or for mother, or for son, or for daughter, for brother, or for sister that hath had no husband, they may defile themselves.
Read midrashic interpretation of Ezekiel 44:25: and classical rabbinic exegesis.