Leviticus 15:19 defines menstrual impurity, which is the condition referenced in the prohibition against approaching a woman during her period.

Leviticus 15:24 describes the uncleanness that results from lying with a menstruating woman, supplementing the prohibition in 18:19.

Leviticus 20:18 prescribes the penalty of being cut off for the same act prohibited in 18:19—lying with a woman during her period.

Ezekiel 18:6 includes not approaching a menstruating woman as a sign of righteousness, directly citing the law from Leviticus.

Ezekiel 22:10 condemns humiliating women during their menstrual period, holding Israel accountable for violating this law.