1 Samuel 1:11-13

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.” As she kept on praying to the LORD, Eli observed her mouth. Hannah was praying in her heart, and her lips were moving but her voice was not heard. Eli thought she was drunk