“וְהִנֵּה יְהוָה נִצָּב עָלָיו, וַיֹּאמַר, אֲנִי יְהוָה אֱלֹהֵי אַבְרָהָם אָבִיךָ, וֵאלֹהֵי יִצְחָק; הָאָרֶץ, אֲשֶׁר אַתָּה שֹׁכֵב עָלֶיהָ–לְךָ אֶתְּנֶנָּה, וּלְזַרְעֶךָ”
“And behold, YHVH stood above it and said, “I am YHVH, the God of Abraham your father and the God of Isaac. The land on which you lie I will give to you and to your offspring.”
The Zohar explains that ‘YHVH stood above’ is above Jacob and not the ladder. God initiated Jacob into the central column. God said ‘I am YHVH, the God of Abraham your father’ then ‘and the God of Isaac’ without the word ‘your father’ to tell Jacob that he comes as Tiferet in the middle, between Abraham, Chessed and Isaac, Gevurah.
Jacob linked first to Abraham and for that it said ‘Abraham your father’ when Isaac was his father and Abraham was his grandfather.
Then comes the connection to Malchut with ‘The land on which you lie’ to complete the chariot with the three columns and Malchut.
The dream made Jacob realize the duty that God put on him to be the unifying factor of the Right and the Left.
The words ‘and the’ in ‘and the God of Isaac’ tell us that there is a connection between Jacob to the Right, ‘God of Abraham’ and the Left, ‘God of Isaac’.