The line I remember from the bible being attributed to “masturbation=bad” is:

“It is better to spill your seed in the belly of a prostitute than it is upon the ground.”

But that really could be interpreted as to the usefulness of reproduction or pleasure and not really a condemnation of jerking it. Like, it sure is better. But I dont have money for a prostitute so the ground will have to do 🤷‍♂️