1SA 1:11

11 She made a vow saying, “O Almighty Commander of the armies of angels, if you will look at me and see how miserable I am, and think about me and allow me to give birth to a son, then I will dedicate him to you [to serve you] for the rest of his life. And [to show that he is dedicated to you], ◄no one will ever [be allowed to] cut his hair/his hair will never be cut►.”