Sahih Adab al-Mufrad

It is narrated from Qais bin Abi Hazim, he said that we went to visit Khabbab. He had been cauterized seven times. He said, "Indeed, our predecessors have passed away and the world could not diminish their status in the least, and indeed we have acquired so much that now we find no place to spend it except in the earth (i.e., burying it). And if the Prophet (peace be upon him) had not forbidden praying for death, I would have prayed for death." After that, when we came again, we saw that he was building one of his walls. He said, "A Muslim receives reward for all his expenses except for what he spends in the earth (i.e., on building a house)."