C. S. Lewis Never Said That
"You don't have a soul. You are a soul, you have a body."
This quotation is often attributed to C.S. Lewis. But he actually never said (or wrote) it.
Also, it's not Biblical.
It's sounds like it might be. And it's very quotable — hence its ubiquity.
But the Bible doesn't separate it out like that. The Biblical view is that we are a soul and we are a body. Our body is not something we carry with us, and then lose once we end this life. A body is an essential part of being human. That's the way God created us.
Even though God isn't physical, He still created physical nature. And He created it to be good. He's not going to get rid of it in the future. He loves it. And His plan it to make it stay. Our bodies are part of that.
The Biblical model of the afterlife does not consist of our souls rising to Heaven to be with God. It's the implementation of a new heaven and a new earth where we live, with bodies, as God intended, in perfect communion with Him.