Commentary for Niddah 67:22

לימא מסייע ליה

it is sufficiently known that her spittle and her urine are only Rabbinically unclean. And why should no distinguishing rule be laid down in respect of her spittle or her urine while her blood should be ruled to be unclean? — Concerning her spittle and her urine, since they are frequently discharged, the Rabbis have enacted a preventive measure, but concerning her blood which is not frequently discharged the Rabbis have enacted no preventive measure.

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