Hannah refused to eat at the feast during their pilgrimage to Shiloh. Elkanah was concerned about her and asked if she would eat something. She was full of anguish and arose from the table to pray again. She made a vow to God that if He would give her a son, she would give Him unto the Lord. After a time, Eli the priest accused her of being drunk, as her mouth moved, but no sound came out.
1 Samuel 1:15–16 (NKJV)
15 But Hannah answered and said, “No, my lord, I am a woman of sorrowful spirit. I have drunk neither wine nor intoxicating drink, but have poured out my soul before the Lord. 16 Do not consider your maidservant a wicked woman, for out of the abundance of my complaint and grief I have spoken until now.”
Eli blessed her and she thanked him for his encouragement. Then she felt better, and ate food and fellowshiped with her family. They returned home, and Elkanah knew his wife, and she conceived. When her son was born, she named him Samuel. Once he was weaned, Hannah took him to the temple and offered animal sacrifices. She left him with Eli, having lent her son to the Lord for all his life.
God is faithful, and fulfills His promises. No matter what you ask of Him, if He makes a promise, He will fulfill it. Have faith in God, and believe without doubt. Live a life of constant faith in God, and He will be faithful!