Even Angels Keep the Commandments

Bless the Lord, ye his angels, that excel in strength, that do his commandments, hearkening unto the voice of his word.
- Psalms 103:20 (KJV)

There was war in heaven over whether or not the angels should keep the commandmnents of God.

And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, and prevailed not; neither was their place found any more in heaven.
- Revelation 12:7-8 (KJV)

Satan convinced a third of the angels to follow him, and abondan the commandments that God had given them.

And his tail drew the third part of the stars [angels] of heaven, and did cast them to the earth: and the dragon stood before the woman which was ready to be delivered, for to devour her child as soon as it was born.
- Revelation 12:4 (KJV)

This essentially started the great controversy.

Good versus evil.