كتاب البيوع
11  
Business Transactions
(8a)
Chapter: Withholding Goods till their Price Rises - Section 1
(8)
باب الاحتكار
Mishkat al-Masabih 2892
Ma'mar reported God's Messenger as saying, “If anyone keeps goods till the price rises he is a sinner.” Muslim transmitted it.
عَن معمر قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنِ احْتَكَرَ فَهُوَ خَاطِئٌ» . رَوَاهُ مُسْلِمٌ
Reference : Mishkat al-Masabih 2892
In-book reference : Book 11, Hadith 129