The Bible doesn't give instructions on how a body should be handled after death. In the cultures of Bible times, burial in a tomb, cave, or in the ground was the common way to dispose of a human body.
Today, obeying the laws of the land regarding corpses is always a significant consideration.Then there is the question of burial vs. cremation. Neither is commanded in the Bible, but neither is prohibited. In the end, it is best to leave that decision to the family of the deceased.
Whatever method is used to dispose of a body is not nearly as important as the truth that the body is no longer housing the person who has died. Paul describes our bodies as “tents” that are temporary abodes. “Now we know that if the earthly tent we live in is destroyed, we have a building from God, an eternal house in heaven, not built by human hands” (2 Corinthians 5:1). When Jesus returns, Christians will be raised to life and our bodies will be transformed to glorified, eternal bodies. “So will it be with the resurrection of the dead. The body that is sown is perishable, it is raised imperishable; it is sown in dishonor, it is raised in glory; it is sown in weakness, it is raised in power” (1 Corinthians 15:42-43).
For just as through the disobedience of the one man the many were made sinners, so also through the obedience of the one man the many will be made righteous. Romans 5:19