Ejaculation is mentioned in Leviticus 15:16-18 and refers to it as the “seed of copulation.” It’s required of the man to clean everything the semen touches, including himself, since he’s seen as unclean until the evening. In Genesis 38:9, there’s a Bible verse on wasting sperm when Onan disobeys Judah by releasing semen on the ground, which results in being punished by God.