Matthew Poole and continuators on 1 Samuel 1:21

21 And the man Elkanah, and all his house , went up to offer unto the LORD the yearly sacrifice , and his vow .

i. e. His Wife Penimah, and his Children, which are oft-times called a Mans House in Scripture, Hannah only and her Child excepted, as it here follows.

That Solemn Sacrifice which was offerd up once every Year, probably the Paschal Lamb, which is oft called a Sacrifice, as Exod. 12. 27. and 34. 25.

By which it appears, though it was not expressed before, that he heard and consented to her Vow, which was necessary to make it Obligatory, Numb. 30. and that he added a Vow of his own, of some singular Sacrifice to be offered, if God answered his Prayers.