(3) The Hadeeth of Saqeefah
حَدِيثُ السَّقِيفَةِ
Musnad Ahmad 396 
It was narrated that Ibn `Umar (رضي الله عنه) said:
The Messenger of Allah (ﷺ)said: “Whoever buys foodstuff should not sell it until he takes possession of all of it.”
حَدَّثَنَا إِسْحَاقُ بْنُ عِيسَى، أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَنْ ابْتَاعَ طَعَامًا فَلَا يَبِعْهُ حَتَّى يَسْتَوْفِيَهُ‏.‏
Grade :  Sahih (Darussalam) [ al-Bukhari (2126) and Muslim (1525)] (Darussalam)
Reference : Musnad Ahmad 396
In-book reference : Book 3, Hadith 6