A place prepared
In my Father’s house are many mansions: if it were not so, I would have told you. I go to prepare a place for you. And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.
Jesus spoke these words to friends who were about to lose Him. He knew how frightened they would be, so He told them where He was going and why.
He is preparing a place. That is personal language, the kind you use about a spare room made ready for someone you love.
If someone you love has died in Christ, they have not gone into nothing. They have gone home to a prepared place, received by the One who prepared it.
And He has made the same promise to you: "I will come again, and receive you unto myself." The separation is real, but it is not forever.