Nidah 9a #1: Hashem turns Tamei blood into Tahor milk.

Nidah 9a #2: Hashem turns Tamei semen into a Tahor baby ¹ .

Nidah 9a #3: Hashem decreed that one who has Mei Chatas sprinkled on him, he becomes Tahor, but one who touches it becomes Tamei.

Bamidbar Rabah 19:1: Hashem brings Avraham from Terach, Chizkiyah from Achaz, Yoshiyah from Amon, Mordechai from Shim'i ben Gera, Yisrael from idolaters, and the world to come from this world.

Rashi: Can a Tahor person come from a putrid drop of semen, which is Tamei? Not one such person is Tahor, and will not sin!

Malbim: How can Tahor come from Tamei? The branch always resembles the root. The plant resembles the seed from which it came. Man was born from a woman, from Tamei - semen and Dam Nidah. How can he reverse his nature to be unlike the lowliness of his source?!