1 Samuel 1:11; 1 Samuel 1:20

11 And she made a vow, saying, “LORD Almighty, if you will only look on your servant’s misery and remember me, and not forget your servant but give her a son, then I will give him to the LORD for all the days of his life, and no razor will ever be used on his head.”

20 So in the course of time Hannah became pregnant and gave birth to a son. She named him Samuel, saying, “Because I asked the LORD for him.”