פּירוש אויף שמואל א 1:21

“The man Elkanah ascended” [1:21]. Elkanah ascended with his whole household to Shiloh to offer sacrifices and a sacrifice for his son that Hannah had given birth to. Hannah did not go up and waited to wean the son that she had given birth to. She said: when I will wean him, then I will bring him to God to serve Him forever.

Our sages say that Samuel only lived for fifty-two years and then he died. A levite should not serve more than fifty years. ⁷Numbers Rabbah, 3.8; Yalkut Shimoni, I Samuel, Remez, 78. She said that I will nurse him for two years and afterwards he should serve God forever. This is fifty years that the levites serve in the Temple. Our sages say, he should have lived longer, but because Saul became king through the hands of Samuel and he died soon after. Saul was only king for three years and therefore Samuel had to die so that he would not see the death of king Saul.⁸B. Ta’anit, 5b.

The festival offering. [Targum renders] the sacrifices of the appointed seasons.

And his vow. The vows he made between festivals he would offer on the next festival.³²Ibid., 6a.