Your tithes were already paid.

[Pliny]

Originally Posted by Originalist

Since you have no biblical answer to any of these questions, you cannot make a doctrine out of it for everybody.

And Abraham returned the property because he did not view the king's permission as a valid enough reason to keep it. He knew in the sight of God that was not his property. Thus he did indeed tithe on other people's property. There would have been nothing to tithe otherwise. Why did he not go to his own flocks and tithe from that? Your theory has more holes than swiss cheese.

Since you have no Biblical answer to my questions you have no right to make a doctrine out of it for anybody.