Matthew Henry on Genesis 49:1-2

All Jacob's sons were living. His calling them together was a precept for them to unite in love, not to mingle with the Egyptians; and foretold that they should not be separated, as Abraham's sons and Isaac's were, but should all make one people. We are not to consider this address as the expression of private feelings of affection, resentment, or partiality; but as the language of the Holy Ghost, declaring the purpose of God respecting the character, circumstances, and situation of the tribes which descended from the sons of Jacob, and which may be traced in their histories.