Mosiah 2 - 3

The righteous King Benjamin tells his people some things that were made known unto him by an angel from God. It appears the angel came while he was sleeping and the angel said -

"...Awake; and I awoke, and behold he stood before me.
3 And he said unto me: Awake, and hear the words which I shall tell thee; for behold, I am come to declare unto you the glad tidings of great joy.
4 For the Lord hath heard thy prayers, and hath judged of thy righteousness, and hath sent me to declare unto thee that thou mayest rejoice; and that thou mayest declare unto thy people, that they may also be filled with joy." (Book of Mormon Mosiah 3:2 - 4)

The very purpose of the angel's visit was to declare Christ -

For behold, the time cometh, and is not far distant, that with power, the Lord Omnipotent who reigneth, who was, and is from all eternity to all eternity, shall come down from heaven among the children of men, and shall dwell in a tabernacle of clay, and shall go forth amongst men, working mighty miracles, such as healing the sick, raising the dead, causing the lame to walk, the blind to receive their sight, and the deaf to hear, and curing all manner of diseases.
6 And he shall cast out devils, or the evil spirits which dwell in the hearts of the children of men...And he shall be called Jesus Christ, the Son of God, the Father of heaven and earth, the Creator of all things from the beginning; and his mother shall be called Mary.
9 And lo, he cometh unto his own, that salvation might come unto the children of men even through faith on his name; and even after all this they shall consider him a man, and say that he hath a devil, and shall scourge him, and shall crucify him." (Book of Mormon Mosiah 3:5 - 9)

And with that the Angel reveals -

"...he shall suffer temptations, and pain of body, hunger, thirst, and fatigue, even more than man can suffer, except it be unto death; for behold, blood cometh from every pore, so great shall be his anguish for the wickedness and the abominations of his people." (Book of Mormon Mosiah 3:7)

And -

"...his blood atoneth for the sins of those who have fallen by the transgression of Adam..." (Book of Mormon Mosiah 3:11)

But not all -

"...For salvation cometh to none such except it be through repentance and faith on the Lord Jesus Christ." (Book of Mormon Mosiah 3:12)

Faith and repentance meaning to -

"...love the Lord thy God with all thy heart, with all thy might, mind, and strength; and in the name of Jesus Christ...serve him...[and] offer a sacrifice unto the Lord thy God in righteousness, even that of a broken heart and a contrite spirit." (Doctrine and Covenants Section 59:5 - 8)

That all his children -

"...might receive remission of their sins, and rejoice with exceedingly great joy..." (Book of Mormon Mosiah 3:13)

"For the natural man is an enemy to God, and has been from the fall of Adam, and will be, forever and ever, unless he yields to the enticings of the Holy Spirit, and putteth off the natural man and becometh a saint through the atonement of Christ the Lord, and becometh as a child, submissive, meek, humble, patient, full of love, willing to submit to all things which the Lord seeth fit to inflict upon him, even as a child doth submit to his father." (Book of Mormon Mosiah 3:19)

And then with plainness the Angel reveals -

"...there shall be no other name given nor any other way nor means whereby salvation can come unto the children of men, only in and through the name of Christ, the Lord Omnipotent." (Book of Mormon Mosiah 3:17)

Let it be known to" every nation, kindred, tongue, and people."