Abram believed the Lord, and the Lord considered his response of faith as proof of genuine loyalty.

My integrity will testify for me later on. When you come to verify that I've taken only the wages we agreed on, if I have in my possession any goat that is not speckled or spotted or any sheep that is not dark-colored, it will be considered stolen."

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