Mishkat al-Masabih #2772
Business Transactions
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
عَن معمر قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنِ احْتَكَرَ فَهُوَ خَاطِئٌ» . رَوَاهُ مُسْلِمٌ
Ma'mar reported God's Messenger as saying, “If anyone keeps goods till the price rises he is a sinner.”
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #2772 from Mishkat al-Masabih, in the Book of Business Transactions.