פּירוש אויף בראשית 45:14

ויפל על צוארי בנימן אחיו ויבך AND HE FELL UPON HIS BROTHER BENJAMIN’S NECK AND WEPT — for the Temples which were to be in Benjamin’s territory and which would ultimately be laid in ruins (Genesis Rabbah 93:12).

ויפול, seeing that Joseph and Binyamin were full brothers the bond between them was stronger. They cried one after another.

ויפול על צוארי בנימין אחיות, “he fell on the neck of his brother Binyamin.” The verse tells us that Joseph embraced Binyamin and Binyamin embraced his brother Joseph by each one falling on the other’s neck, a customary gesture amongst brothers who wanted to demonstrate their fondness for each other. Solomon refers to such an embrace in Song of Songs 8,1 when he wrote: “if only I could embrace you as I would embrace a brother who has nursed at my mother’s breast.” The intimate relations between brothers of the same mother are also spelled out in the Torah in Deut. 13,7 where the Torah describes a secret seduction to idolatrous practices by someone who is the brother of the second party by the same mother.” Evidently, the Torah considers the bond between two sons of the same mother as stronger than a similar bond by two sons of the same father. The reason our verse refers to צוארי, i.e. “two necks,” is that a person’s “neck” consists of two parts known as עורף and גרון respectively. Jeremiah 2,27 distinguishes between עורף and פנים, the rear of the neck and the part of the neck facing forward. The sides of the neck are also known as צואר.

ובנימין בכה על צואריו AND BENJAMIN WEPT ON HIS NECK — for the Tabernacle of Shiloh which was to be in Joseph’s territory and which would ultimately be laid in ruins (Genesis Rabbah 93:12).