Likutei Moharan 42:4/ליקוטי מוהר"ן מ״ב:ד׳

14. This also corresponds to the shofar blasts. For the tekiah shevarim teruah are the patriarchs Avraham, Yitzchak and Yaakov. The mnemonic for this is KeSheT (rainbow)—i.e., teKiah [Shevarim Teruah].

2And this is the explanation of “Shadai (the Almighty) will be your fortification” (Job 22:25). For the name ShaDaI <corresponds to> the Patriarchs. The Shin is the three branches of the tree, which are the Patriarchs. They are the three names of the unification YHVH AELoHeINU YHVH, which have fourteen letters—the DI of ShaDaI. In addition, the first letters of Avraham Yitzchak Yaakov are also the first letters of YHVH Ӕloheinu YHVH.