Most Relevant Verses
Then you shall be released from my oath, when you come to my family. And if they will not give [a woman] to you, then you will be released from my oath.'
But Onan knew that the offspring would not be for him, so whenever he went in to the wife of his brother he would waste [it] on the ground so as not to give offspring to his brother.
Topics on Not Giving
And let us not grow weary in doing good, for at the proper time we will reap, [if we] do not give up.