الْأَدَبُ الْمُفْرَدُ
Al-Adab al-Mufrad 455
Extravagance in Building
The person who builds
ثُمَّ أَتَيْنَاهُ مَرَّةً أُخْرَى، وَهُوَ يَبْنِي حَائِطًا لَهُ، فَقَالَ: إِنَّ الْمُسْلِمَ يُؤْجَرُ فِي كُلِّ شَيْءٍ يُنْفِقُهُ إِلاَّ فِي شَيْءٍ يَجْعَلُهُ فِي التُّرَابِ.
He continued, "Then we came to him another time while he was building a wall and his and he said, 'The Muslim is rewarded for everything on which he spends money except for what he spends on dust.'
Al-Adab Al-Mufrad, 455Sahih (Al-Albani)صـحـيـح (الألباني)