Leviticus 15:25
And if a woman have an issue of her blood many days out of the time of her separation, or if it run beyond the time of her separation; all the days of the issue of her uncleanness shall be as the days of her separation: she shall be unclean.
And if a woman have an issue of her blood many days out of the time of her separation,.... Not an ordinary but an extraordinary one, not within that time, but out of it, and which continued three days at least; so the Targum of Jonathan, and sometimes many years; as the poor woman Christ cured, which she had had twelve years,
See Gill on "Matthew 9:20":
or if it run beyond the time of her separation; beyond the seven days of her separation, and so out of the usual way and time of it; whereby it appears to be somewhat extraordinary and unusual:
all the days of the issue of her uncleanness shall be as the days of her separation: all the while it was upon her, be it ever so many days or years, she was kept apart from her husband, and in all respects in the same condition and circumstances, as in the seven days of her separation because of her monthly courses:
she shall be unclean; as long as it is upon her, and neither be admitted to her husband's bed, nor to the house of God, which made her condition a very deplorable one.