2 Nephi 26:15
After my seed and the seed of my brethren shall have dwindled in unbelief, and shall have been smitten by the Gentiles; yea, after the Lord God shall have camped against them round about, and shall have laid siege against them with a mount, and raised forts against them; and after they shall have been brought down low in the dust, even that they are not, yet the words of the righteous shall be written, and the prayers of the faithful shall be heard, and all those who have dwindled in unbelief shall not be forgotten.
2 Nephi 32:8-9
And now, my beloved brethren, I perceive that ye ponder still in your hearts; and it grieveth me that I must speak concerning this thing. For if ye would hearken unto the Spirit which teacheth a man to pray ye would know that ye must pray; for the evil spirit teacheth not a man to pray, but teacheth him that he must not pray.
But behold, I say unto you that ye must pray always, and not faint; that ye must not perform any thing unto the Lord save in the first place ye shall pray unto the Father in the name of Christ, that he will consecrate thy performance unto thee, that thy performance may be for the welfare of thy soul.
Alma 5:46
Behold, I say unto you they are made known unto me by the Holy Spirit of God. Behold, I have fasted and prayed many days that I might know these things of myself. And now I do know of myself that they are true; for the Lord God hath made them manifest unto me by his Holy Spirit; and this is the spirit of revelation which is in me.
Alma 17:3But 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 of God.
Alma 34:19
Yea, humble yourselves, and continue in aprayer unto him.
Alma 34:27
Yea, and when you do not cry unto the Lord, let your hearts be full, drawn out in prayer unto him continually for your welfare, and also for the welfare of those who are around you.
3 Nephi 12:44 (Matthew 5:44)
But behold I say unto you, love your enemies, bless them that curse you, do good to them that hate you, and pray for them who despitefully use you and persecute you.
Moroni 7: 6, 9
For behold, God hath said a man being evil cannot do that which is good; for if he offereth a gift, or prayeth unto God, except he shall do it with real intent it profiteth him nothing.
And likewise also is it counted evil unto a man, if he shall pray and not with real intent of heart; yea, and it profiteth him nothing, for God receiveth none such.
Moroni 7:48
Wherefore, my beloved brethren, pray unto the Father with all the energy of heart, that ye may be filled with this love, which he hath bestowed upon all who are true followers of his Son, Jesus Christ; that ye may become the sons of God; that when he shall appear we shall be like him, for we shall see him as he is; that we may have this hope; that we may be purified even as he is pure. Amen.
Moroni 8:26
And the remission of sins bringeth meekness, and lowliness of heart; and because of meekness and lowliness of heart cometh the visitation of the Holy Ghost, which Comforter filleth with hope and perfect love, which love endureth by diligence unto prayer, until the end shall come, when all the saints shall dwell with God.
D&C 6:22-24
Verily, verily, I say unto you, if you desire a further witness, cast your mind upon the night that you cried unto me in your heart, that you might know concerning the truth of these things.
Did I not speak peace to your mind concerning the matter? What greater witness can you have than from God?
And now, behold, you have received a witness; for if I have told you things which no man knoweth have you not received a witness?
D&C 25:12
For my soul delighteth in the song of the heart; yea, the song of the righteous is a prayer unto me, and it shall be answered with a blessing upon their heads.
D&C 31:12
Pray always, lest you enter into temptation and lose your reward.
D&C 46: 7
But ye are commanded in all things to ask of God, who giveth liberally; and that which the Spirit testifies unto you even so I would that ye should do in all holiness of heart, walking uprightly before me, considering the end of your salvation, doing all things with prayer and thanksgiving, that ye may not be seduced by evil spirits, or doctrines of devils, or the commandments of men; for some are of men, and others of devils.
D&C 52:15
Wherefore he that prayeth, whose spirit is contrite, the same is accepted of me if he obey mine cordinances.
D&C 68:28
And they shall also teach their children to pray, and to walk uprightly before the Lord.
D&C 98:2
Waiting patiently on the Lord, for your prayers have entered into the ears of the Lord of Sabaoth, and are recorded with this seal and testament--the Lord hath sworn and decreed that they shall be granted.
D&C 103:36
All victory and glory is brought to pass unto you through your diligence, faithfulness, and prayers of faith.
D&C 112:10
Be thou humble; and the Lord thy God shall lead thee by the hand, and give thee answer to thy prayers.
D&C 136: 28
If thou art merry, praise the Lord with singing, with music, with dancing, and with a prayer of praise and thanksgiving.
