A comparison of 2 Samuel 18:4, explains exactly the meaning of the “side of the gate,” and Eli’s position. His seat or throne, without a back, stood with the side against the jamb of the gate, leaving the passage through the gate quite clear, but placed so that every one passing through the gate must pass in front of him.
Forty years - This chronological note connects this book with that of Judges. (Compare Judges 3:11, etc.) It is an interesting question, but one very difficult to answer how near to the death of Phinehas, the son of Eleazar the High Priest, Eli’s forty years of judgeship bring him. It is probable that at least one high priesthood intervened.