Sahih al-Bukhari 5169

It is related that Qays ibn Abi Hazim said, "We went to visit Khabbab when he was ill. He had been cauterised seven times. He said, 'Our companions who went before us have gone and this world did not cause them any decrease. We have acquired so much that the only way to spend it is in constructing buildings. If it were not that the Prophet, may Allah bless him and grant him peace, had forbidden us to pray for death, I would have prayed for it.' "Then we came to him again when he was repairing one of his walls and he said, 'A Muslim is rewarded for everything he spends except for what he invests in buildings.'"