Midrasch zu Bereschit 27:7

Abraham also pleaded for death with his own lips, as it is said: What wilt thou give me, seeing I go hence childless (Gen. 15:2). Thereupon the Holy One, blessed be He, said to him: Thou shalt go to thy fathers in peace (ibid., v. 15). Isaac likewise sought death, as is said: That I may eat, and bless thee before the Lord before my death (ibid. 35:29). Similarly, Jacob asked for death, as is said: Now let me die (ibid. 46:30). The Holy One, blessed be He, told him: You have said: Now let me die, but you will live seventeen additional years. After that time had passed he became ill and died.

And it came to pass after these things (Gen. 48:1). Scripture states in response to this verse: For such as are blessed of Him shall inherit the land; and they that are cursed of Him shall be cut off (Ps. 37:22). R. Meir said: Every one who blesses Israel is considered to have blessed the Holy Spirit, since it is said: For such as blessed Him. The verse is not written “blessed them” but rather blessed Him. R. Simeon the son of Yohai declared: Every one who assists Israel is considered to be assisting the Holy Spirit, as is said: Curse ye bitterly the inhabitants thereof, because they came not to help of the Lord (Judg. 5:23). Does the Holy One, blessed be He, actually require assistance? This verse teaches us that one who aids Israel is considered to be aiding the Holy Spirit. R. Ishmael said: You find that righteous men bless their children when they are about to leave this life. That is why Isaac said to Esau: And bless thee before the Lord before my death (Gen. 27:7). Therefore, when Jacob became ill, Joseph took his two sons unto his father so that he might bless them.