Charles Ellicott Commentary Leviticus 15:2

"Speak unto the children of Israel, and say unto them, When any man hath an issue out of his flesh, because of his issue he is unclean." — Leviticus 15:2 (ASV)

A running issue out of his flesh. —Flesh, as is frequently the case, euphemistically denotes private parts. (Genesis 7:13; Leviticus 6:3; Leviticus 16:4; Ezekiel 16:26; Ezekiel 23:20, and so on).

Because of his issue he is unclean. —Better, his issue is unclean. Hence, anyone coming in contact with it, or with the garment on which traces of the secretion are found, is thereby made unclean.