Jamieson, Fausset and Brown on Ezekiel 44:3

3. the prince--not King Messiah, as He never would offer a burnt offering for Himself, as the prince is to do (Eze 46:4). The prince must mean the civil ruler under Messiah. His connection with the east gate (by which the Lord had returned to His temple) implies, that, as ruling under God, he is to stand in a place of peculiar nearness to God. He represents Messiah, who entered heaven, the true sanctuary, by a way that none other could, namely, by His own holiness; all others must enter as sinners by faith in His blood, through grace.

eat bread before the Lord--a custom connected with sacrifices (Ge 31:54; Ex 18:12; 24:11; 1Co 10:18).