John Gill Commentary Leviticus 12:4

"And she shall continue in the blood of [her] purifying three and thirty days; she shall touch no hallowed thing, nor come into the sanctuary, until the days of her purifying be fulfilled." — Leviticus 12:4 (ASV)

And she shall continue in the blood of her purifying three
and thirty days
That is, so many more, in all forty; for though at the end of seven days she was in some respects free from her uncleanness, yet not altogether, but remained in the blood of her purifying, or in the purifying of her blood, which was more and more purified, and completely at the end of forty days: so with the Persians it is said, a new mother must avoid everything for forty days; when that time is passed, she may wash and be purified ^F14 ; and which perhaps Zoroastres, the founder of the Persian religion, at least the reformer of it, being a Jew, as is by some supposed, he might take it from here:

she shall touch no hallowed thing ;
as the tithe, the heave offering, the flesh of the peace offerings, as Aben Ezra explains it, if she was a priest's wife:

nor come into the sanctuary ;
the court of the tabernacle of the congregation, or the court of the temple, as the same writer observes; and so with the Greeks, a pregnant woman might not come into a temple before the fortieth day ^F15 , that is, of her delivery:

until the days of her purifying be fulfilled ;
until the setting of the sun of the fortieth day; on the morrow of that she was to bring the atonement of her purification, as Jarchi observes; (See Gill on Leviticus 12:6).

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FOOTNOTES:

• F14: Lib. Shad-der, port. 86. apud Hyde Hist. Relig. Vet. Pers. p. 478.
• F15: Censorinus apud Grotium in loc.