Isaiah 53:12 begins with the word, “Therefore“. This is, I think, connected to the whole of this chapter. Because of all of His suffering according to the Father’s will, and because of His guilt offering and His satisfaction–because of all of that, “I [Yahweh] will divide Him a portion with the many, and He shall divide the spoil with the strong“. The imagery that’s given here is that of a conqueror sharing his victory with his allies. We are recipients of the spoils of our Conqueror’s victory!
There’s something ironic about that. What is it? We were His enemies. We were the one who put Him on the cross because of our sins. Yet He shares the spoils of His victory with us. We were not His allies. We were not fighting with Him for this victory. We left Him alone and joined the voices of the scoffers. Were we there, we, like His most trusted friends, would have fled and not returned. Yet He shared His victory with us. We are saved because of what He has done. “He poured out His soul to death and was numbered with the transgressors; yet He bore the sins of many, and makes intercession for the transgressors“. He, alone, won this. And by a mysterious grace and love, we are the beneficiaries. We are treated as “the strong” (v12). What an indescribable joy we should feel at every moment of our lives.