By the mouth of angels

1. Mosiah 4: 11
   11 And again I say unto you as I have said before, that as ye have come to the knowledge of the glory of God, or if ye have known of his goodness and have tasted of his love, and have received a remission of your sins, which causeth such exceedingly great joy in your souls, even so I would that ye should remember, and always retain in remembrance, the greatness of God, and your own nothingness, and his goodness and long-suffering towards you, unworthy creatures, and humble yourselves even in the depths of humility, calling on the name of the Lord daily, and standing steadfastly in the faith of that which is to come, which was spoken by the mouth of the angel.
2. Alma 13: 22, 25-26
   22 Yea, and the voice of the Lord, by the mouth of angels, doth declare it unto all nations; yea, doth declare it, that they may have glad tidings of great joy; yea, and he doth sound these glad tidings among all his people, yea, even to them that are scattered abroad upon the face of the earth; wherefore they have come unto us.
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   25 And now we only wait to hear the joyful news declared unto us by the mouth of angels, of his coming; for the time cometh, we know not how soon. Would to God that it might be in my day; but let it be sooner or later, in it I will rejoice.
   26 And it shall be made known unto just and holy men, by the mouth of angels, at the time of his coming, that the words of our fathers may be fulfilled, according to that which they have spoken concerning him, which was according to the spirit of prophecy which was in them.
3. Alma 36: 5
   5 Now, behold, I say unto you, if I had not been born of God I should not have known these things; but God has, by the mouth of his holy angel, made these things known unto me, not of any worthiness of myself;
4. D&C 43: 25
   25 How oft have I called upon you by the mouth of my servants, and by the ministering of angels, and by mine own voice, and by the voice of thunderings, and by the voice of lightnings, and by the voice of tempests, and by the voice of earthquakes, and great hailstorms, and by the voice of famines and pestilences of every kind, and by the great sound of a trump, and by the voice of judgment, and by the voice of mercy all the day long, and by the voice of glory and honor and the riches of eternal life, and would have saved you with an everlasting salvation, but ye would not!