Mishkat al-Masabih 11 Business Transactions كتاب البيوع 133

وَعَنِ ابْنِ عُمَرَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنِ احْتَكَرَ طَعَامًا أَرْبَعِينَ يَوْمًا يُرِيدُ بِهِ الْغَلَاءَ فَقَدْ بَرِئَ مِنَ اللَّهِ وَبَرِئَ اللَّهُ مِنْهُ» . رَوَاهُ رَزِينٌ

Ibn ‘Umar reported God’s Messenger as saying, “If anyone with-holds grain for forty days thereby desiring a high price, he has renounced God and God has renounced him.” Razin transmitted it.