Al-Adab Al-Mufrad #457
Extravagance in Building
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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.'
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About Al-Adab Al-Mufrad
This hadith is #457 from Al-Adab Al-Mufrad, in the Book of Extravagance in Building.