The Doctrine and Covenants, Section 88:106-107

106 And again, another angel shall sound his trump, which is the seventh angel, saying: It is finished; it is finished! The Lamb of God hath overcome and trodden the wine-press alone, even the wine-press of the fierceness of the wrath of Almighty God.

107 And then shall the angels be crowned with the glory of his might, and the saints shall be filled with his glory, and receive their inheritance and be made equal with him.

The Doctrine and Covenants, Section 88:112

112 And Michael, the seventh angel, even the archangel, shall gather together his armies, even the hosts of heaven.