Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:12210a –
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السيوطي:١٢٢١٠a –

"بِئسَ العبدُ المحتَكر إِذَا أَرْخَصَ اللهُ الأسْعَارَ حَزِنَ وَإِن أغْلاها اللهُ فَرِحَ".  

[طب] الطبرانى في الكبير [عد] ابن عدى في الكامل [هب] البيهقى في شعب الإيمان عن معاذ (قال: سألت رسول الله ﷺ عن الاحتكار ما هو؟ قال: إِذا سمع برخص ساءه، وإِذا سمع بغلاء فرح به، بئس العبد، وذكره، وسنده ضعيف)

See similar narrations below:

Collected by Ṭabarānī
tabarani:17384 – Aḥmad b. al-Naḍr al-ʿAskarī > Sulaymān b. Salamah al-Khabāʾirī > Baqiyyah b. al-Walīd > Thawr b. Yazīd > Khālid b. Maʿdān > Muʿādh b. Jabal

[Machine] I asked the Messenger of Allah ﷺ about hoarding, what is it? He said, "When he hears about cheap prices, he becomes upset, and when he hears about high prices, he becomes happy. How evil is the hoarding servant! If Allah lowers prices, he becomes sad, and if Allah raises them, he becomes happy."  

الطبراني:١٧٣٨٤ – حَدَّثَنَا أَحْمَدُ بْنُ النَّضْرِ الْعَسْكَرِيُّ ثنا سُلَيْمَانُ بْنُ سَلَمَةَ الْخَبَائِرِيُّ ثنا بَقِيَّةُ بْنُ الْوَلِيدِ ثنا ثَوْرُ بْنُ يَزِيدَ عَنْ خَالِدِ بْنِ مَعْدَانَ عَنْ مُعَاذِ بْنِ جَبَلٍ قَالَ

سَأَلْتُ رَسُولَ اللهِ ﷺ عَنِ الِاحْتِكَارِ مَا هُوَ؟ قَالَ «إِذَا سَمِعَ بِرُخْصٍ سَاءَهُ وَإِذَا سَمِعَ بِغَلَاءٍ فَرِحَ بِهِ بِئْسَ الْعَبْدُ الْمُحْتَكِرُ إِنْ أَرْخَصَ اللهُ الْأَسْعَارَ حَزِنَ وَإِنْ أَغْلَاهَا اللهُ فَرِحَ»