“וַיַּגֵּד לְיַעֲקֹב–וַיֹּאמֶר, הִנֵּה בִּנְךָ יוֹסֵף בָּא אֵלֶיךָ; וַיִּתְחַזֵּק, יִשְׂרָאֵל, וַיֵּשֶׁב, עַל-הַמִּטָּה”
“When it was told to Jacob, “Behold, your son Joseph has come to you,” Israel collected his strength and sat up in the bed.”
The Zohar reveals that “it was told to Jacob” by angel that in the future will support the Israelites when they return to YHVH at time of troubles. The Mashiach will come and the good ones of the children of Israel will be redeem.
The children of Israel are called sons to the Holy One Blessed be He. We are the only nation on the central column that can reach all the way up to Keter, while the other 70 nations of the world dependent on the Israelites to draw light to the world for their benefits. This is the reason behind the 70 bulls sacrificed in the Holy Temple during the holiday of Sukkot.