1 Samuel 2:27

There came a man of God. — Of this messenger of the Highest, whom, from his peculiar title, and also from the character of his communication, we must regard as one of the order of prophets, we know nothing. He appears suddenly on the scene at Shiloh, nameless and — as far as we know — homeless, delivers his message of doom, and disappears.

The term “man of God” we find applied to Moses and to different prophets some forty or more times in the Books of Judges, Samuel, and Kings. It occurs, though but rarely, in Chronicles, Ezra, and Nehemiah, and in the prophetical books only once.
Until the sudden appearance of this “man of God,” no mention of a prophet in the story of Israel had been made since the days of Deborah.

Did I plainly appear... — The interrogations in this Divine message do not ask a question with a view to a reply, but simply emphatically appeal to Eli’s conscience. To these questions respecting well-known facts the old man would reply with a silent “Yes.” The “house of thy father” refers to the house of Aaron, the first high priest, from whom, through Ithamar, the fourth son of Aaron, Eli was descended.

The Talmud has a beautiful note on this passage: — Rabbi Shimon ben Yochi said, “Come and see how beloved Israel is by the Holy One! Blessed be He! Wherever they are banished, there the Shekinah is with them; as it is said (1 Samuel 2:27): ‘Did I (God) plainly appear unto the house of thy fathers when they were in Egypt?’ &c. When they were banished to Babylon, the Shekinah was with them; as it is said (Isaiah 43:14): ‘For your sakes was I sent to Babylon.’ And when they will be redeemed the Shekinah will be with them; as it is said (Deuteronomy 30:3): ‘Then the Lord thy God will return with thy captivity;’ it is not said, He will cause to return (transitively), but He will return (intransitively).” — Treatise Meguillah, fol. 29, Colossians 1.