From that time Jesus began to preach, and to say, Repent: for the kingdom of heaven is at hand.
And from the days of John the Baptist until now the kingdom of heaven suffers violence, and the violent take it by force.
And there shall in no wise enter into it any thing that defiles, neither whatever works abomination, or makes a lie: but they which are written in the Lamb’s book of life.
And said, Truly I say to you, Except you be converted, and become as little children, you shall not enter into the kingdom of heaven.
1 Corinthians 6:9-10
Know you not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind, Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortionists, shall inherit the kingdom of God.
Jesus answered and said to him, Truly, truly, I say to you, Except a man be born again, he cannot see the kingdom of God.
Blessed are the poor in spirit: for theirs is the kingdom of heaven.
Not every one that said to me, Lord, Lord, shall enter into the kingdom of heaven; but he that does the will of my Father which is in heaven.
For I say to you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, you shall in no case enter into the kingdom of heaven.
And Jesus said to him, No man, having put his hand to the plough, and looking back, is fit for the kingdom of God.