1 Samuel 1:23 New English Translation

²³Then her husband Elkanah said to her, “Do what you think best.^[a] Stay until you have weaned him. Only may the Lord fulfill his promise.”^[b]

So the woman stayed and nursed her son until she had weaned him.

1 Samuel 1:23 tn Heb “what is good in your eyes.”sn A similar phrase is a negative characterization in Judges, that “each would do what was right in his [own] eyes” (Judg 17:6; 21:25, cf. Prov 12:15; 21:2). However the phrase “in one’s own eyes” does not have to have a negative connotation (1 Chron 13:4; 30:4). As Hannah had done, Elkanah affirms the long term commitment to the vow.
1 Samuel 1:23 tc LXX and Qumran “establish what is coming out of your mouth.” MT “establish his word.”sn By reading “his word” (i.e., his promise) the MT is consistent with other passages that deal with establishing God’s word. But what it refers to is unclear. If Eli’s earlier response (v. 17) implies a promise, it has already been fulfilled in the birth. Other have suggested a connection to Deut 18:15, 18 and the promise to raise up a prophet like Moses. The reading preserved in the Greek text and at Qumran may well be the original. In this case Elkanah is affirming the conclusion of Hannah’s vow. Perhaps there is even an underlying admonition in the affirmation. Auld suggests it is possible that readers should discern in Elkanah an affirmation of the prophetic word through Hannah (Graeme Auld, I & II Samuel [Louisville: Westminster John Knox Press, 2011] 33).

New English Translation (NET)