Leviticus 12:4

And she shall then 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.

Cross-reference

Leviticus 12:5 immediately follows, giving the longer purification period for a daughter — contrasting with the son's 33 days.

Leviticus 15:25-28 gives parallel rules for a woman with an abnormal discharge, showing broader purity laws for bodily emissions.

Leviticus 15:19 describes menstrual uncleanness, similar to postpartum impurity but with different duration and rules.

Luke 2:22 records Mary fulfilling this purification law after Jesus' birth, showing its New Testament application.