1 Samuel 25:30-31

“And it shall come about when the LORD shall do for my lord according to all the good that He has spoken concerning you, and shall appoint you ruler over Israel, that this will not cause grief or a troubled heart to my lord, both by having shed blood without cause and by my lord having avenged himself. When the LORD shall deal well with my lord, then remember your maidservant.”

1 Samuel 1:11

“And she made a vow and said, “O LORD of hosts, if Thou wilt indeed look on the affliction of Thy maidservant and remember me, and not forget Thy maidservant, but wilt give Thy maidservant a son, then I will give him to the LORD all the days of his life, and a razor shall never come on his head.”