and he must wash in water any clothing or leather that has semen on it, and it will be unclean until evening.

This is the law of the one with a discharge: the one who has a seminal emission ¹  and becomes unclean by it, ² 

“‘When a man has a seminal emission, ¹  he must bathe his whole body in water ²  and be unclean until evening,

When a man has sexual intercourse with a woman and there is a seminal emission, ¹  they must bathe in water and be unclean until evening.

No man ¹  from the descendants of Aaron who is diseased or has a discharge ²  may eat the holy offerings until he becomes clean. The one ³  who touches anything made unclean by contact with a dead person, ⁴  or a man who has a seminal emission, ⁵ 

But Onan knew that the child ¹  would not be considered his. ²  So whenever ³  he had sexual relations with ⁴  his brother’s wife, he withdrew prematurely ⁵  so as not to give his brother a descendant.

Did you not pour ¹  me out like milk, and curdle ²  me like cheese? ³