Vayikra(14:5): Another understanding of Vayikra (12:2), If a woman conceives and bears a male child...Dovid alluded to this understanding in Tehilim (51:7), Behold I was formed in sin and in sin my mother conceived me. Rav Acha explained, Even if a person is the most pious of the pious – it is impossible that he doesn’t have an aspect of sin in him. Dovid said to G‑d, “Master of the Universe, did my father Yishai have the intention to bring me into the world – when he had intercourse with my mother. The fact is that he was only thinking about his own sexual enjoyment.The proof for my assertion is that after they both had satisfied their desires he turned his face in one direction and she turned her face in the opposite direction. And it was only You who caused every single drop of semen to enter.” This assertion is alluded to by Dovid in (Tehilim 27:10), For though my father and my mother deserted me, G‑d did gather me in.