Charles Spurgeon Commentary Deuteronomy 33:4-6

"Moses commanded us a law, An inheritance for the assembly of Jacob. And he was king in Jeshurun, When the heads of the people were gathered, All the tribes of Israel together. Let Reuben live, and not die; Nor let his men be few." — Deuteronomy 33:4-6 (ASV)

Here is his blessing, Let Reuben live. Reuben's great sin had lost him his birthright, yet Moses gives him as much of his blessing as he can. If we are not allowed to draw the largest blessing, let us go as far as we can.