Matthew 18:3

and said: Verily I say to you, Unless you turn and become as little children, you can not enter the kingdom of heaven.

Mark 10:14-15

And when Jesus saw it, he was displeased, and said to them: Let the little children come to me, and forbid them not; for of such is the kingdom of God.

1 Peter 2:2

as new-born babes, earnestly desire the pure spiritual milk, that you may grow by it,

1 Corinthians 14:20

Brethren, be not children in understanding: yet, in malice, be childlike; but, in understanding, be full-grown men.

Matthew 19:14

But Jesus said: Let the little children come to me, and forbid them not: for of such is the kingdom of heaven.

Matthew 5:20

For I say to you, That, unless your righteousness excel that of the scribes and Pharisees, you can by no means enter into the kingdom of heaven.

Luke 18:16-17

And Jesus called them to him, and said: Let the little children come to me, and hinder them not; for of such is the kingdom of God.

Luke 22:32

But I have prayed for you, Simon, that your faith fail not. And when you have turned to me again, strengthen your brethren.

Matthew 5:18

For verily I say to you, Till heaven and earth pass away, one yod or one point shall in no way pass from the law till all be fulfilled.

Matthew 6:2

When, therefore, you do a charitable deed, do not cause a trumpet to be sounded before you, as the hypocrites do, in the synagogues and in the streets, that they may be glorified by men. Verily, I say to you, They have their reward.

Matthew 6:5

And when you pray, you shall not be like the hypocrites; for they love to pray standing in the synagogues, and in the corners of the streets, that they may be seen by men. Verily, I say to you, They have their reward.

Matthew 6:16

And when you fast, do not put on a sad countenance, as the hypocrites do; for they disfigure their faces, that they may appear to men to be fasting. Verily, I say to you, They have their reward.

Matthew 13:15

For the heart of this people has become fat; and with their ears they hear heavily; and their eyes they have closed; lest they should see with their eyes, and hear with their ears, and understand with their heart, and should turn to me, and I should give them health.

Matthew 19:23

Jesus said to his disciples: Verily I say to you, A rich man will with difficulty enter into the kingdom of heaven.

Mark 4:12

that they may surely see, and not perceive; and that they may surely hear, and not understand; lest they should turn to me, and their sins should be forgiven them.

Luke 13:24

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

John 1:51

Jesus answered and said to him: Do you believe, be cause I said to you, I saw you under the fig-tree? You shall see greater things than these. And he said to him: Verily, verily I say to you, From this time you shall see heaven opened, and the angels of God ascending and descending upon the Son of man.

John 3:3

Jesus answered and said to him: Verily, verily I say to you, unless a man be born again, he can not see the kingdom of God.

John 3:5

Jesus answered: Verily, verily I say to you, unless a man be born of water and of the Spirit, he can not enter into the kingdom of God.

Acts 3:19

Repent, therefore, and turn, in order that your sins may be blotted out, so that seasons of refreshing may come from the presence of the Lord,

Acts 14:22

strengthening the souls of the disciples, exhorting them to continue in the faith, and saying, that through many afflictions we mast enter the kingdom of God.

Acts 28:27

For the heart of this people has become fat, and with their ears they hear heavily, and their eyes they have closed, lest they should see with their eyes, and hear with their ears, and understand with their heart, and should turn, and I should restore them to health.

James 5:19-20

Brethren, if any among you should err from the truth, and one should turn him back,

2 Peter 1:11

For thus will an entrance be given you abundantly into the eternal kingdom of our Lord and Savior 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 when Jesus saw it, he was displeased, and said to them: Let the little children come to me, and forbid them not; for of such is the kingdom of God.
Luke 18:16
And Jesus called them to him, and said: Let the little children come to me, and hinder them not; for of such is the kingdom of God.
1 Corinthians 14:20
Brethren, be not children in understanding: yet, in malice, be childlike; but, in understanding, be full-grown men.
1 Peter 2:2
as new-born babes, earnestly desire the pure spiritual milk, that you may grow by it,

General references

Mark 10:15
Verily I say to you, Whoever will not receive the kingdom of God as a little child, shall not enter into it.
Luke 9:46
And there arose a contention among them, which of them should be greatest.
Luke 22:26
But you shall not be so; but let the greatest among you be as the younger, and him that is chief, as he that serves.
Acts 8:19
saying: Give me, also, this authority, that who ever I shall lay my hands on, may receive the Holy Spirit.