2 Nephi 26
20 And the Gentiles are lifted up in the pride of their eyes, and have stumbled, because of the greatness of their stumbling block, that they have built up many churches; nevertheless, they put down the power and miracles of God, and preach up unto themselves their own wisdom and their own learning, that they may get gain and grind upon the face of the poor.
21 And there are many churches built up which cause envyings, and strifes, and malice.
22 And there are also secret combinations, even as in times of old, according to the combinations of the devil, for he is the founder of all these things; yea, the founder of murder, and works of darkness; yea, and he leadeth them by the neck with a flaxen cord, until he bindeth them with his strong cords forever.
1 Nephi 14
8 And it came to pass that when the angel had spoken these words, he said unto me: Rememberest thou the covenants of the Father unto the house of Israel? I said unto him, Yea.
9 And it came to pass that he said unto me: Look, and behold that great and abominable church, which is the mother of abominations, whose founder is the devil.
10 And he said unto me: Behold there are save two churches only; the one is the church of the Lamb of God, and the other is the church of the devil; wherefore, whosobelongeth not to the church of the Lamb of God belongeth to that great church, which is the mother of abominations; and she is the harlot of all the earth.
11 And it came to pass that I looked and beheld the harlot of all the earth, and she sat upon many waters; and she had dominion over all the earth, among all nations, kindreds, tongues, and people.
Doctrine and Covenants 1:30
30 And also those to whom these commandments were given, might have power to lay the foundation of this church, and to bring it forth out of obscurity and out of darkness, the only true and living church upon the face of the whole earth, with which I, the Lord, am well pleased, speaking unto the church collectively and not individually—