1 Samuel 1:21 New English Translation

²¹Then the man Elkanah and all his family went up to make the yearly sacrifice^[a] to the Lord and to keep his vow.^[b]

1 Samuel 1:21 tn Heb “sacrifice of days.” The plural “days” often refers to a set of days, commonly a year, thus an annual sacrifice (cf. 1 Sam 2:29; 20:6).
1 Samuel 1:21 tn The Hebrew suffix could be “his vow” or “its vow,” referring to his household’s vow. sn The only vow that has been mentioned so far is Hannah’s. This either implies an additional vow not made known to us, or implies Elkanah’s affirmation of her vow. According to Num 30:6-8 a husband could nullify his wife’s vow, or allow it to stand. tc The LXX adds “and all the tithes of his land.”

New English Translation (NET)