Doctrine and Covenants 34: 4-7

4 And blessed are you because you have believed;

5 And more blessed are you because you are called of me to preach my gospel—

6 To lift up your voice as with the sound of a trump, both long and loud, and cry repentance unto a crooked and perverse generation, preparing the way of the Lord for his second coming.

7 For behold, verily, verily, I say unto you, the time is soon at hand that I shall come in a cloud with power and great glory.