Most Relevant Verses
Then shalt thou be quit of my oath, when thou shalt have come to my family. And if they give thee not one, thou shalt be quit of my oath.
But when Onan knew that the seed should not be his own, it came to pass when he went in to his brother's wife, that he spilled it on the ground, in order to give no seed to his brother.
Topics on Not Giving
but let us not lose heart in doing good; for in due time, if we do not faint, we shall reap.