The Catechism in Questions & Answers

686. What happens at a church funeral?

In the funeral service, the life of the deceased is honoured in appropriate fashion. The soul and spirit of the departed are commended to the love of the Redeemer Jesus Christ with the blessed reassurance that He may preserve them until the resurrection to eternal life. The soulless body of the deceased is surrendered to the earth.

“In the sweat of your face you shall eat bread till you return to the ground, for out of it you were taken; for dust you are, and to dust you shall return.”
Genesis 3: 19