Matthew 18:3

and said, Verily I say unto you, Except ye be converted and become as little children, ye shall not enter into the kingdom of the heavens.

Mark 10:14-15

And Jesus seeing it, became angry and said unto them, Suffer the little children to come unto me and hinder them not, for of such is the kingdom of God.

1 Peter 2:2

as newborn babes, desire the rational milk of the word, that ye may grow thereby in health;

1 Corinthians 14:20

Brothers, be not children in understanding, howbeit in malice be ye children; but in understanding be perfect.

Matthew 19:14

But Jesus said, Suffer the little children to come unto me and forbid them not, for of such is the kingdom of the heavens.

Psalm 131:2

Rather I have quieted myself and caused my soul to become silent, that I might be as a child that is weaned of his mother, as one who is weaned from my own life.

Matthew 5:20

For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of the heavens.

Luke 18:16-17

But Jesus called them unto him and said, Suffer the little children to come unto me and forbid them not, for of such is the kingdom of God.

Luke 22:32

but I have prayed for thee that thy faith fail not; and when thou art converted, strengthen thy brethren.

Psalm 51:10-13

Create in me a clean heart, O God, and renew a right spirit within me.

Isaiah 6:10

Make the heart of this people fat and make their ears heavy and blind their eyes that they not see with their eyes, nor hear with their ears, nor understand with their heart, nor convert and there be healing for him.

Matthew 5:18

For verily I say unto you, Until heaven and earth pass away, not one jot or one tittle shall pass from the law until all is fulfilled.

Matthew 6:2

Therefore, when thou doest thine alms, do not sound a trumpet before thee, as the hypocrites do in the synagogues and in the streets that they may have glory of men. Verily I say unto you, They already have their reward.

Matthew 6:5

And when thou prayest, thou shalt not be as the hypocrites are, for they love to pray standing in the synagogues and in the corners of the streets that they may be seen of men. Verily I say unto you, They already have their reward.

Matthew 6:16

Moreover when ye fast, be not, as the hypocrites, of a sad countenance, for they disfigure their faces that they may appear unto men to fast. Verily I say unto you, They already have their reward.

Matthew 13:15

for this people's heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed lest at any time they should see with their eyes and hear with their ears and should understand with their heart and should be converted, and I should heal them.

Matthew 19:23

Then said Jesus unto his disciples, Verily I say unto you, It is difficult that a rich man shall enter into the kingdom of the heavens.

Mark 4:12

that seeing they may see and not perceive, and hearing they may hear and not understand, lest at any time they should be converted, and their sins should be forgiven them.

Luke 13:24

Strive to enter in at the narrow gate; for many, I say unto you, will seek to enter in and shall not be able.

John 1:51

And he said unto him, Verily, verily, I say unto you, Hereafter ye shall see the heaven open and the angels of God ascending and descending upon the Son of man.

John 3:3

Jesus answered and said unto him, Verily, verily, I say unto thee, Except a person be born again from above, he cannot see the kingdom of God.

John 3:5

Jesus answered, Verily, verily, I say unto thee, Unless a man is born of water and of the Spirit, he cannot enter into the kingdom of God.

Acts 3:19

Repent ye therefore and be converted that your sins may be blotted out, for the times of refreshing of the presence of the Lord are come;

Acts 14:22

confirming the souls of the disciples and exhorting them to remain in the faith, and that we must through much tribulation enter into the kingdom of God.

Acts 28:27

for the heart of this people is waxed gross, and their ears are dull of hearing, and their eyes have they closed; lest they should see with their eyes and hear with their ears and understand with their heart and should be converted and I should heal them.

James 5:19-20

Brethren, if any of you have erred from the truth, and someone should convert him;

2 Peter 1:11

Because in this manner the entrance shall be abundantly administered unto you in the eternal kingdom of our Lord and Saviour Jesus Christ.

Treasury of Scripture Knowledge

Summary

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.

Bible References

And become

Mark 10:14
And Jesus seeing it, became angry and said unto them, Suffer the little children to come unto me and hinder them not, for of such is the kingdom of God.
Luke 18:16
But Jesus called them unto him and said, Suffer the little children to come unto me and forbid them not, for of such is the kingdom of God.
1 Corinthians 14:20
Brothers, be not children in understanding, howbeit in malice be ye children; but in understanding be perfect.
1 Peter 2:2
as newborn babes, desire the rational milk of the word, that ye may grow thereby in health;

General references

Mark 10:15
Verily I say unto you, Whosoever shall not receive the kingdom of God as a little child, he shall not enter therein.
Luke 9:46
Then there arose a dispute among them, which of them should be the greatest.
Luke 22:26
But ye shall not be so, but he that is greatest among you, let him be as the younger; and he that is prince, as he that doth serve.
Acts 8:19
saying, Give me also this power, that on whomsoever I lay hands, he may receive the Holy Spirit.