When a man takes an oath to the Lord, or gives an undertaking having the force of an oath, let him not go back from his word, but let him do whatever he has said he will do.
And her husband Elkanah said to her, Do whatever seems right to you, but not till you have taken him from the breast; only may the Lord do as he has said. So the woman, waiting there, gave her son milk till he was old enough to be taken from the breast.