Hophni and Phinehas wanted their portion before the Lord received his.1 In terms of order, the fat was supposed to be burned before any food was consumed (cf. Leviticus 3:1–11). The fat portions would be the fat around the organs but not the fat that is mixed in with the muscle. These portions were understood to be the richest part of the animal which is why they were exclusively reserved for the Lord (cf. Genesis 4:4; Leviticus 3:17; Leviticus 7:23–25).2
15 Même avant qu'on fasse brûler la graisse, le serviteur du sacrificateur arrivait et disait à celui qui offrait le sacrifice: Donne pour le sacrificateur de la chair à rôtir; il ne recevra de toi point de chair cuite, c'est de la chair crue qu'il veut.