[mlizzy]

Where does it say in Scriptures that people are allowed into Heaven with sin?

You'll have to be more clear with whatever you were asking in the first place. If it has to do with purgatory, here's an explanatory link if you're interested. (Heaven is for cleaned-up souls, not sinners.)

[Tennessee Nana]

(Heaven is for cleaned-up souls, not sinners.)
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Actually Heaven is for redeemed souls...

Washed clean through the Blood that jesus shed on the Cross...

Those who have asked forgiveness of their sins and have confessed the LORD Jesus Christ as their Savior..

[GiovannaNicoletta]

Jesus cleans up a person's soul when they accept Him as Savior.

There is nothing anyone can do to make himself clean in the eyes of God apart from salvation in Christ. The acceptance of Christ as Savior and the surrender of a person's life to Christs' lordship over that life is what gets a person into heaven. There is no work a person can perform that God will accept as salvation and which will make a person be seen as sinless by God.

There is no Scripture that even hints that the return of Jesus Christ gets put on hold while human beings attempt to work their way into acceptance by God.

Christ's return for those who know Him as Savior will happen, it will happen soon, and there is no part of that return that is contingent on the actions or behaviors of men.