John Wesley on Deuteronomy 33:6

Let Reuben live - Though Reuben deserve to be cut off or greatly diminished and obscured, according to Jacob's prediction, Gen 49:4, yet God will spare them and give them a name and portion among the tribes of Israel, and bless them with increase of their numbers. All the ancient paraphrasts refer this to the other world, so far were they from expecting temporal blessings only. Let Reuben live in life eternal, says Onkelos, and not die the second death. Let Reuben live in this world, so Jonathan and the Jerusalem Targum, and not die that death which the wicked die in the world to come.