Midrash su Salmi 116:7

(Deut. 33:1:) “Before his death.” Would it cross your mind that he blessed Israel after he died?¹¹PRK 31(suppl. 1):14; see Sifre, Deut. 33:19(342); Deut. R. 11:6. Then what is the meaning of before his death? Before the angel of death. When the Holy One, blessed be He, said to him (in Deut. 32:49-50) “Ascend [this mountain of the Abarim]…. And you shall die,” the angel of death thought that the Holy One, blessed be He, had already given him authority over Moses' life. He came and stood directly above him. Moses said to him, “The Holy One, blessed be He, has already promised me that he would not deliver me into your hand.” He [answered], “The Holy One, blessed be He, has sent me to you; that you are to depart on this day.” Moses said to him, “Go away from here, as I want to praise the Holy One, blessed be He, ‘I will not die, but rather live and tell the acts of the Lord (Ps. 118:17).’” The angel said to him, “Why are you bragging, He [already] has someone to praise Him, (in Ps. 19:2), ‘The heavens recount God’s glory.’” Moses said, “I will quiet them and praise,” as stated (in Deut. 32:1), “Listen O heavens....” He came to him a second time. What did Moses do? He mentioned the explicit name [of God], and [so the angel] fled, as stated (Deut. 32:3), “For I proclaim the name of the Lord.” He [then] came to him a third time. [At that point,] Moshe said, “Since he is coming from the Heavens, I must justify the judgement [of death] upon myself.” He immediately began saying (in Deut. 32:4), “The Rock, His actions are just.” R. Isaac said, “Moses’ soul was hesitating to leave him, and he spoke with it. He said to it, ‘Tell me, my soul, what will you say, since the angel of death seeks to subdue you?’ It said to him, ‘He will not do so to me, as the Holy One, blessed be He, promised me that he would not deliver me into his hand.’ He said to it, ‘Tell me [what you will say] when you see them crying and you cry with them.’ It said to him (in Ps. 116:8), ‘You have delivered me from death, my eyes from tears’. He said to it, ‘Tell me [what you will say] when they try to push you to Gehinnom.’ It said to him (in Ps. 116:8, cont.), ‘my feet from stumbling.’ He said to it, ‘And where will you be walking in the future?’ It said to him (in Ps 116:9), ‘I shall walk before the Lord in the lands of the living.’ When Moses heard this from it, he said to it (Ps. 116:7), ‘Return, O my soul.’” R. Abba said, “Once he was departed, the lower creatures (people) said (Deut. 33:4), ‘Moses charged us with Torah.’ The higher creatures (angels) said, ‘He executed the Lord’s judgments and His decisions for Israel.’ And even the Holy One, blessed be He, Himself, in all of His glory praises him and says (in Deut. 34:10-11), ‘Never again did there arise in Israel a prophet like Moses [...]. For the various signs and portents.’”