Matthew Henry Commentary Deuteronomy 33:1-5

"And this is the blessing, wherewith Moses the man of God blessed the children of Israel before his death. And he said, Jehovah came from Sinai, And rose from Seir unto them; He shined forth from mount Paran, And he came from the ten thousands of holy ones: At his right hand was a fiery law for them. Yea, he loveth the people; All his saints are in thy hand: And they sat down at thy feet; [Every one] shall receive of thy words. 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." — Deuteronomy 33:1-5 (ASV)

To all his precepts, warnings, and prophecies, Moses added a solemn blessing. He begins with a description of the glorious appearances of God in giving the law.

His law works like fire. If received, it is melting, warming, purifying, and burns up the dross of corruption; if rejected, it hardens, sears, pains, and destroys.

The Holy Spirit came down in cloven tongues, as of fire; for the gospel also is a fiery law. The law of God written in the heart is a certain proof of the love of God poured out there: we must consider His law one of the gifts of his grace.