"And there were exceedingly many prophets among us. And the people were a stiffnecked people, hard to understand." (Enos 1:22)
"And the next day we that were of Paul’s company departed, and came unto Cæsarea: and we entered into the house of Philip the evangelist, which was one of the seven; and abode with him. And the same man had four daughters, virgins, which did prophesy.
"And as we tarried there many days, there came down from Judæa a certain prophet, named Agabus. And when he was come unto us, he took Paul’s girdle, and bound his own hands and feet, and said, Thus saith the Holy Ghost, So shall the Jews at Jerusalem bind the man that owneth this girdle, and shall deliver him into the hands of the Gentiles.
"And when we heard these things, both we, and they of that place, besought him not to go up to Jerusalem. Then Paul answered, What mean ye to weep and to break mine heart? for I am ready not to be bound only, but also to die at Jerusalem for the name of the Lord Jesus. And when he would not be persuaded, we ceased, saying, The will of the Lord be done." (Paul, Acts 21:8-14)
Agabus' prophecy was fulfilled.
"And it came to pass that in this year there was one Samuel, a Lamanite, came into the land of Zarahemla, and began to preach unto the people. And it came to pass that he did preach, many days, repentance unto the people, and they did cast him out, and he was about to return to his own land.
"But behold, the voice of the Lord came unto him, that he should return again, and prophesy unto the people whatsoever things should come into his heart.
"And it came to pass that they would not suffer that he should enter into the city; therefore he went and got upon the wall thereof, and stretched forth his hand and cried with a loud voice, and prophesied unto the people whatsoever things the Lord put into his heart." (Samuel the Lamanite, Helaman 13-16)
"And it came to pass that there was a man among them whose name was Abinadi; and he went forth among them, and began to prophesy, saying: Behold, thus saith the Lord, and thus hath he commanded me, saying, Go forth, and say unto this people, thus saith the Lord—Wo be unto this people, for I have seen their abominations, and their wickedness, and their whoredoms; and except they repent I will visit them in mine anger. And except they repent and turn to the Lord their God, behold, I will deliver them into the hands of their enemies; yea, and they shall be brought into bondage; and they shall be afflicted by the hand of their enemies. And it shall come to pass that they shall know that I am the Lord their God, and am a jealous God, visiting the iniquities of my people. And it shall come to pass that except this people repent and turn unto the Lord their God, they shall be brought into bondage; and none shall deliver them, except it be the Lord the Almighty God. Yea, and it shall come to pass that when they shall cry unto me I will be slow to hear their cries; yea, and I will suffer them that they be smitten by their enemies. And except they repent in sackcloth and ashes, and cry mightily to the Lord their God, I will not hear their prayers, neither will I deliver them out of their afflictions; and thus saith the Lord, and thus hath he commanded me." (Abinadi, Mosiah 11-17)
"And it came to pass that many of the Lamanites did come down into the land of Zarahemla, and did declare unto the people of the Nephites the manner of their conversion, and did exhort them to faith and repentance. Yea, and many did preach with exceedingly great power and authority, unto the bringing down many of them into the depths of humility, to be the humble followers of God and the Lamb." (Heleman 6:4-5)
What was their "great power and authority"? The power of God himself; their words were rejoiced over in the heavens and the Holy Ghost testified with them.