Revelations

Hi Ghost Kid! I’m surprised nobody answered your question yet, so I will answer it.

Revelations: 22:14-15 14 Blessed are those who wash their robes, so that they may have the right to the tree of life and that they may enter the city by the gates. 15 Outside are the dogs and sorcerers and the sexually immoral and murderers and idolaters, and everyone who loves and practices falsehood.

The blessed are those who’s robes are washed with the blood of Jesus Christ. The people who believed in Christ Jesus with faith alone and who were saved before they died.

Those who die before believing in Jesus Christ go to Sheol, the realm of the dead. That’s the outside, the people who practice falsehoods, who believed a lie instead of believing in Jesus Christ.

So, Jesus will go to them and convince them to believe in Him.

Revelation 1:18: "I [Jesus] have the keys of Death and Hades."

Hades also translated as Sheol, the realm of the dead. He will keep convincing them until everyone believes in Him. He will keep convincing them until everyone has entered the city.

Psalm 16:10 You will not leave my soul in Sheol.

Psalm 86:13 For thy true love stands high above me; thou hast rescued my soul from the depths of Sheol.

Psalm 139:8 If I go up to the heavens, you are there; if I make my bed in Sheol, you are there.

The Lord promises that Sheol aka Hell aka Hades will be empty!

The previous chapter, Revelations 21:27 says “But nothing unclean will ever enter it, nor anyone who does what is detestable or false, but only those who are written in the Lamb's book of life.”

This is true because every single person in existence will become clean by believing in Christ. Inside of believing in something detestable or false, they will believe in the truth, that Jesus Christ died for everyone’s sins!

Whose names will be written in the Lamb’s book of life? Everyone! As soon as someone believes in Christ with faith alone, as in saved, Jesus writes their name in this book. Christ Jesus will keep writing people’s names into this book until everyone’s names are in it!

As well, don’t forget later in Revelations 22:21 it says “The grace of the Lord Jesus be with all. Amen.”.

Christ our Saviour has grace for all people, it will be with all as everyone received salvation. This is the same grace mentioned here:

Titus 2:11 For the grace of God has appeared, bringing salvation for all people

And here:

Heb. 2:9 "Jesus, was made a little lower than the angels, for the suffering of death crowned with glory and honor, that He, by the grace of God, might taste death for everyone."

Christ tasted death for everyone, the wages of sin, so everyone can be alive permanently in Heaven, the New Jerusalem.

Again, sorry for the delay. I just noticed now your question was unanswered, so I hope this helps. Feel free to let me know if you have any other questions, I am more than happy to help you out my friend :D