Deuteronomy 12:32 NIV

Deuteronomy 4:2 NIV
Do not add to what I command you and do not subtract from it, but keep the commands of the Lord your God that I give you.

Revelation 22:18-19 NIV
I warn everyone who hears the words of the prophecy of this scroll: If anyone adds anything to them, God will add to that person the plagues described in this scroll. And if anyone takes words away from this scroll of prophecy, God will take away from that person any share in the tree of life and in the Holy City, which are described in this scroll.