Qatadah said:

Hoarding does not apply to dried dates. Ibn al-Muthanna said that he (Yahya b. Fayyad) reported on the authority of al-Hasan. We (Ibn al-Muthanna) said to him (Yahya): Do not say: "on the authority of al-Hasan." Abu Dawud said: This tradition according to us is false. Abu Dawud said: Sa'id b. al-Musayyab used to hoard kernel, fodder, and seeds. Abu Dawud said: I heard Ahmad b. Yunus say: I asked Sufyan about hoarding fodder. He replied: They (the people in the past) disapproved of hoarding. I asked Abu Bakr b. 'Ayyash (about it). He replied: Hoard it.

حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى بْنِ فَيَّاضٍ، حَدَّثَنَا أَبِي ح، وَحَدَّثَنَا ابْنُ الْمُثَنَّى، حَدَّثَنَا يَحْيَى بْنُ الْفَيَّاضِ، حَدَّثَنَا هَمَّامٌ، عَنْ قَتَادَةَ، قَالَ لَيْسَ فِي التَّمْرِ حُكْرَةٌ ‏.‏ قَالَ ابْنُ الْمُثَنَّى قَالَ عَنِ الْحَسَنِ فَقُلْنَا لَهُ لاَ تَقُلْ عَنِ الْحَسَنِ ‏.‏ قَالَ أَبُو دَاوُدَ هَذَا الْحَدِيثُ عِنْدَنَا بَاطِلٌ ‏.‏ قَالَ أَبُو دَاوُدَ كَانَ سَعِيدُ بْنُ الْمُسَيَّبِ يَحْتَكِرُ النَّوَى وَالْخَبَطَ وَالْبِزْرَ سَمِعْتُ أَحْمَدَ بْنَ يُونُسَ يَقُولُ سَأَلْتُ سُفْيَانَ عَنْ كَبْسِ الْقَتِّ فَقَالَ كَانُوا يَكْرَهُونَ الْحُكْرَةَ وَسَأَلْتُ أَبَا بَكْرِ بْنَ عَيَّاشٍ فَقَالَ اكْبِسْهُ ‏.‏