No unclean thing can enter the kingdom of God
“Wherefore, if ye have sought to do wickedly in the days of your probation, then ye are found unclean before the judgment-seat of God; and no unclean thing can dwell with God; wherefore, ye must be cast off forever” (1 Nephi 10:21).
“But behold, I say unto you, the kingdom of God is not filthy, and there cannot any unclean thing enter into the kingdom of God” (1 Nephi 15:34).
“And he doth not dwell in unholy temples; neither can filthiness or anything which is unclean be received into the kingdom of God” (Alma 7:21).
“And I say unto you again that he cannot save them in their sins; for I cannot deny his word, and he hath said that no unclean thing can inherit the kingdom of heaven; therefore, how can ye be saved, except ye inherit the kingdom of heaven?” (Alma 11:37).
“But behold, an awful death cometh upon the wicked; for they die as to things pertaining to things of righteousness; for they are unclean, and no unclean thing can inherit the kingdom of God” (Alma 40:26).
“And no unclean thing can enter into his kingdom” (3 Nephi 27:19).
“Wherefore teach it unto your children, that all men, everywhere, must repent, or they can in nowise inherit the kingdom of God, for no unclean thing can dwell there, or dwell in his presence” (Moses 6:57).
Become as a little child spiritually
“Every spirit of man was innocent in the beginning; and God having redeemed man from the fall, men became again, in their infant state, innocent before God” (D&C 93:38).
“At the same time came the disciples unto Jesus, saying, Who is the greatest in the kingdom of heaven? And Jesus called a little child unto him, and set him in the midst of them, And said, Verily I say unto you, Except ye be converted, and become as little children, ye shall not enter into the kingdom of heaven. Whosoever therefore shall humble himself as this little child, the same is greatest in the kingdom of heaven. And whoso shall receive one such little child in my name receiveth me” (Matthew 18:1-5).
“But Jesus called them unto him, and said, Suffer little children to come unto me, and forbid them not: for of such is the kingdom of God. Verily I say unto you, Whosoever shall not receive the kingdom of God as a little child shall in no wise enter therein” (Luke 18:16-7; see also Mark 10:14-5).
“For behold he judgeth, and his judgment is just; and the infant perisheth not that dieth in his infancy; but men drink damnation to their own souls except they humble themselves and become as little children, and believe that salvation was, and is, and is to come, in and through the atoning blood of Christ, the Lord Omnipotent. 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” (Mosiah 3:18-9).
“Therefore, whoso repenteth and cometh unto me as a little child, him will I receive, for of such is the kingdom of God” (3 Nephi 9:22).
“And again I say unto you, ye must repent, and become as a little child, and be baptized in my name, or ye can in nowise receive these things. And again I say unto you, ye must repent, and be baptized in my name, and become as a little child, or ye can in nowise inherit the kingdom of God” (3 Nephi 11:37-8).