Westminster Larger Catechism in modern English question number nineteen:
Q. 19. What is God’s providence concerning angels?
A. By His providence, God permitted some of the angels to willfully and irrecoverably fall into sin and damnation, His decree limiting and ordering that fall and all their sins to His own glory and establishing the rest in holiness and happiness. By His providence, He employs them all at His pleasure in the administrations of His power, mercy, and justice.