וַיִּפֹּ֛ל עַל־צַוְּארֵ֥י בִנְיָמִֽן־אָחִ֖יו וַיֵּ֑בְךְּ וּבִנְיָמִ֔ן בָּכָ֖ה עַל־צַוָּארָֽיו׃
И он пал на своего брата Вениамина'с шеей, и плакал; Вениамин плакал на шее своей.
Rashi on Genesis
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).
Radak on Genesis
ויפול, seeing that Joseph and Binyamin were full brothers the bond between them was stronger. They cried one after another.
Haamek Davar on Genesis
He fell on his necks: On both sides of his neck, he fell on one side of his neck and then on the other side out of great love.