1 Samuel 2:20, 21
Eli would bless Elkanah and his wife, saying, "May the Lord give you children by this woman to take the place of the one she prayed for and gave to the Lord." Then they would go home. And the Lord was gracious to Hannah; she conceived and gave birth to three sons and two daughters. Meanwhile, the boy Samuel grew up in the presence of the Lord.

Does the promise, “Give and it shall be given unto you” work in this regard too? Well, it seems to have worked wonderfully for Hannah. She gave ‘one’ for the Lord’s service and the Lord gave her 5 more.
Many people make vows to the Lord when they are in desperate situations like Hannah was, but later on after receiving their miracle, they forget their vows. God expects us to be faithful to Him when we make vows.

The Bible also advises us,
“Guard your steps when you go to the house of God. Go near to listen rather than to offer the sacrifice of fools, who do not know that they do wrong. Do not be quick with your mouth; do not be hasty in your heart to utter anything before God. God is in heaven and you are on earth, so let your words be few. When you make a vow to God, do not delay in fulfilling it. He has no pleasure in fools; fulfill your vow. It is better not to vow than to make a vow and not fulfill it. (Ecclesiastes 5:1, 2, 4, 5)

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Dr. Johnson Cherian MD. PhD.