The Lord establish his word; either, first, The word of God made known to them by Eli, above, 1 Samuel 4:17, which being delivered by God's high priest, and that in answer to his and his wife's prayers, he took to be a kind of oracle sent from God. But that word was already fulfilled in the birth of a son. Or, secondly, Some other word or message from God to Elkanah or his wife concerning Samuel; for such revelations were frequent in those ages of the church, and were oft vouchsafed by God, concerning such children as were extraordinary persons, or in a special manner devoted to God; as concerning Isaac, Ge 18, and Samson, Judges 13:3,4, and John Baptist, Luke 1:13,14, &c., and others. And so it might be here, though it were not mentioned before, there being many such things in Scripture omitted in their proper places, which afterwards are expressed or implied upon other occasions. Or rather, thirdly, It may be rendered his matter, or thing, i.e. the business concerning the child, that which thou hast promised or vowed concerning him, that he may grow up, and be accepted and employed by God in his service; and that he, when he is fully grown, may not break thy vow, but confirm it.
Related Commentaries of 1 Samuel 1:23
1 Samuel 1:23
23 And Elkanah her husband said unto her, Do what seemeth thee good; tarry until thou have weaned him; only the LORD establish his word. So the woman abode, and gave her son suck until she weaned him.