Albert Barnes Commentary 1 Samuel 1:5

"but unto Hannah he gave a double portion; for he loved Hannah, but Jehovah had shut up her womb." — 1 Samuel 1:5 (ASV)

A worthy portion - This likely refers to the marginal note. Naturally, she would have received a single portion of the sacrifice (Compare 1 Samuel 9:23), but because of his love for her, he gave her a double portion, enough for two people .