Variant reading: “This is what their father Jacob spoke to them” (Genesis 49:28) is not written here, but rather, “their father.” Another man like me is destined to bless you and from the place that I concluded, he will begin, as it is stated: “This is what [their father] spoke.” When Moses stood, he began with “this,” as it is stated: “This is the blessing [that Moses, the man of God, blessed the children of Israel with before his death]” (Deuteronomy 33:1). [Jacob] said to them: ‘I will say these blessings to you.
When will they take effect? When you receive the Torah,’ as it is stated: “This is the Torah” (Deuteronomy 4:44). That is, “this is what their father spoke to them.” With that which their father Jacob concluded [in blessing] them, Moses began [blessing] them.
Moses said: “I gain insight from the elders, [for I uphold Your edicts]” (Psalms 119:100). Isaac, when he blessed Jacob, and said to him: “And God Almighty [will bless you]” (Genesis 28:3), with what did he conclude? “Isaac summoned Jacob” (Genesis 28:1).55This is called the conclusion because it was the beginning of Isaac’s concluding blessing to Jacob, after he had already blessed him in Genesis ch. 27.
See also a variant reading in Devarim Rabba 11:1. Jacob began from where his father had concluded, as it is stated: “Jacob summoned his sons” (Genesis 49:1), and he concluded when he blessed them with “this” – “this is what [their father] spoke [to them]” (Genesis 49:28). Moses began from where Jacob had concluded: “This is the blessing” (Deuteronomy 33:1). With what did Moses conclude?
“Happy are you Israel” (Deuteronomy 33:29). David, too, when he came to recite a psalm, began from where Moses had concluded: “Happy is the man” (Psalms 1:1). That is, “I gain insight from the elders.” “They came to the threshing floor of Atad, that is beyond the Jordan, and they lamented a very great and substantial lament there, and he observed mourning for his father seven days” (Genesis 50:10).