Matthew 18:3

and he said, "Truly, I say to you, unless you turn and become like little children, you will never enter the kingdom of heaven.

Mark 10:14-15

But when Jesus saw it, he was indignant and said to them, "Let the little children come to me; and do not hinder them, for to such belongs the kingdom of God.

1 Peter 2:2

Like newborn babes, long for the pure spiritual milk, so that by it you may grow up in your salvation,

1 Corinthians 14:20

Brethren, do not be children in your thinking; be infants in evil, but in thinking be mature.

Matthew 19:14

But Jesus said, "Let the little children come to me, and do not hinder them; for to such belongs the kingdom of heaven."

Matthew 5:20

For I tell you, that unless your righteousness exceeds that of the scribes and Pharisees, you will by no means enter the kingdom of heaven.

Luke 18:16-17

But Jesus called them to him and said, "Let the little children come to me, and do not hinder them; for to such belongs the kingdom of God.

Luke 22:32

But I have prayed for you, that your faith may not fail; and when you have turned again, strengthen your brethren."

Matthew 5:18

For truly, I say to you, till heaven and earth pass away, not an iota, not a dot, will by any means pass from the Law until all is accomplished.

Matthew 6:2

"Thus, when you give alms, do not sound a trumpet before you, as the hypocrites do in the synagogues and in the streets, that they may be praised by men. Truly, I say to you, they have received 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 on the street corners, that they may be seen by men. Truly, I say to you, they have received their reward.

Matthew 6:16

"And when you fast, do not look gloomy, like the hypocrites, for they disfigure their faces that they may be seen by men to be fasting. Truly, I say to you, they have received their reward.

Matthew 13:15

For this people's heart has grown dull. And their ears are hard of hearing, and their eyes they have closed, lest they should see with their eyes, and hear with their ears, and they understand with their hearts, and turn so that I should heal them.'

Matthew 19:23

Then Jesus said to his disciples, "Truly I say to you, it is hard for a rich man to enter the kingdom of heaven.

Mark 4:12

so that 'seeing they may see but not perceive, and hearing may hear but not understand; lest they should turn again, and be forgiven.'"

Luke 13:24

"Strive to enter through the narrow door, for many, I tell you, will seek to enter and will not be able.

John 1:51

And he said to him, "Truly, truly, I say to you, you shall see heaven open, and the angels of God ascending and descending upon the Son of Man."

John 3:3

Jesus answered him, "Truly, truly, I say to you, unless one is born again, he cannot see the kingdom of God."

John 3:5

Jesus answered, "Truly, truly, I say to you, unless one is born of water and the Spirit, he cannot enter the kingdom of God.

Acts 3:19

Repent therefore, and turn again, so that your sins may be wiped out, that times of refreshing may come from the presence of the Lord,

Acts 14:22

strengthening the souls of the disciples, encouraging them to continue in the faith, and saying, "Through many tribulations we must enter the kingdom of God."

Acts 28:27

For this people's heart has become dull, and with their ears they scarcely hear, and their eyes they have closed; otherwise they might see with their eyes, and hear with their ears, and understand with their heart and turn, and I would heal them."'

James 5:19-20

My brethren, if anyone among you wanders from the truth and someone brings him back,

2 Peter 1:11

so there will be an entrance richly provided for you 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
But when Jesus saw it, he was indignant and said to them, "Let the little children come to me; and do not hinder them, for to such belongs the kingdom of God.
Luke 18:16
But Jesus called them to him and said, "Let the little children come to me, and do not hinder them; for to such belongs the kingdom of God.
1 Corinthians 14:20
Brethren, do not be children in your thinking; be infants in evil, but in thinking be mature.
1 Peter 2:2
Like newborn babes, long for the pure spiritual milk, so that by it you may grow up in your salvation,

General references

Mark 10:15
Truly, I say to you, whoever does not receive the kingdom of God like a little child will not enter it."
Luke 9:46
And an argument arose among them as to which of them would be the greatest.
Luke 22:26
But not so among you; on the contrary, he who is greatest among you, let him be as the youngest, and he who leads as one who serves.
Acts 8:19
saying, "Give me also this power, so that everyone on whom I lay my hands may receive the Holy Spirit."