John Wesley on Leviticus 15:19

And if a woman - Heb. And a woman when she shall have an issue of blood, and her issue shalt be in her flesh, that is, in her secret parts, as flesh is taken, Lev 15:2. So it notes her monthly disease. Put apart - Not out of the camp, but from converse with her husband and others, and from access to the house of God. Seven days - For sometimes it continues so long; and it was decent to allow some time for purification after the ceasing of her issue. Whosoever toucheth her - Of grown persons. For the infant, to whom in that case she might give suck, was exempted from this pollution by the greater law of necessity, and by that antecedent law which required women to give suck to their own children.