Malachi 2:8

But ye are departed out of the way - Ye are become impure yourselves, and ye have led others into iniquity.

But ye - o are departed out of the way "of knowledge, truth, equity, fear of God, which I appointed to Aaron and the Levites." "Ye have caused many to stumble at the law." He does not simply say, "in the law," but "at" it. The law was what they stumbled at. They did not only misunderstand the law, through the false teaching of the priests, as though it allowed things which in truth were sins (although this too); itself was their source of stumbling. As Jesus Himself was "a rock of offence" whereon they stumbled, because through His divine holiness He was not what they expected Him to be, so contrariwise the law became an offence to them through the unholiness and inconsistency of the lives and ways of those who taught it; much as we now hear Christianity spoken against, because of the inconsistency of Christians. So Paul saith to the Jews Romans 2:24, "The name of God is blasphemed among the Gentiles through you, as it is written;" and, for the sins of Eli's sons (1 Samuel 2:17, Pococke) "men abhorred the offering of the Lord."

And have corrupted the covenant of Levi - as it is said in Nehemiah, Nehemiah 13:29, "They have defiled the priesthood, and the covenant of the priesthood and of Levi, that covenant which was life and peace" Malachi 2:5, and, therefore, forfeited them.

2:8 But ye - Priests. Stumble at the law - By your false expositions of it. Have corrupted - You have violated it, have contradicted the great intentions of it, and done what in you lay, to defeat them.