Spirit of Prophecy according to the Book of Mormon
Manifestation of the Spirit of God:
Alma 3:82 Even so according to the spirit of prophecy, which is in me, which is also by the manifestation of the Spirit of God, I say unto you, that I know of myself that whatsoever I shall say unto you concerning that which is to come, is true,
Know of things to come :
Alma 8:18 And now when Amulek had spoken these words, the people began to be astonished, seeing there was more than one witness who testified of the things whereof they were accused, and also of the things which were to come, according to the spirit of prophecy which was in them;
Alma 14:77 And thus they did retain a hope through faith, unto eternal salvation, relying upon the spirit of prophecy, which spake of those things to come.
2 Nephi 11:5 Wherefore hearken, O my people, which are of the house of Israel, and give ear unto my words: for because the words of Isaiah are not plain unto you, nevertheless, they are plain unto all those that are filled with the spirit of prophecy.
Testimony of Jesus:
Revelation 19:10 And I fell at his feet to worship him. And he said unto me, See that thou do it not; I am thy fellow servant, and of thy brethren that have the testimony of Jesus; worship God; for the testimony of Jesus is the spirit of prophecy.
Alma 4:9-10 And Alma went and began to declare the word of God unto the church which was
established in the valley of Gideon, according to the revelation of the truth of
the word which had been spoken by his fathers, And according to the spirit of prophecy which was in him, according to the testimony of Jesus Christ, the Son of God, who should come to redeem his people from their sins, and the holy order by which he was called. And thus it is written. Amen.
Received through Much Fasting & Prayer:
Alma 12:5 But this is not all: they had given themselves to much prayer, and fasting, therefore they had the spirit of prophecy, and the spirit of revelation, and when they taught, they taught with power and authority, even as with the power and authority of God.
Measure of Health of the Church:
Helaman 2:45 And it was because of the pride of their hearts, because of their exceeding riches, yea, it was because of their oppression to the poor, withholding their food from the hungry, withholding their clothing from the naked, and smiting their humble brethren upon thholding their clothing from the naked, and smiting their humble brethren upon the cheek, making a mock of that which was sacred, denying the spirit of prophecy and of revelation, murdering, plundering, lying, stealing, committing adultery, rising up in great contentions, and deserting away into the land of Nephi, among the Lamanites;
Helaman 2:58 And because of their iniquity, the church had begun to dwindle; and they began to disbelieve in the spirit of prophecy, and in the spirit of revelation; and the judgments of God did stare them in the face.