The Statement of Allah: "...And those who hoard up gold and silver (AI-Kanz—the money, the Zakãt of which has not been paid) and spend it not in the Way of Allah—announce to them a painful torment." (V.9:34)

Sahih al-Bukhari · Book 65 · Hadith 4659

حَدَّثَنَا الْحَكَمُ بْنُ نَافِعٍ، أَخْبَرَنَا شُعَيْبٌ، حَدَّثَنَا أَبُو الزِّنَادِ، أَنَّ عَبْدَ الرَّحْمَنِ الأَعْرَجَ، حَدَّثَهُ أَنَّهُ، قَالَ حَدَّثَنِي أَبُو هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّهُ سَمِعَ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏"‏ يَكُونُ كَنْزُ أَحَدِكُمْ يَوْمَ الْقِيَامَةِ شُجَاعًا أَقْرَعَ ‏"‏‏.‏

Narrated Abu Huraira: Allah's Messenger (ﷺ) said, "The Kanz (money, the Zakat of which is not paid) of anyone of you will appear in the form of bald-headed poisonous male snake on the Day of Resurrection."

Sahih al-Bukhari · Book 65 · Hadith 4660

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا جَرِيرٌ، عَنْ حُصَيْنٍ، عَنْ زَيْدِ بْنِ وَهْبٍ، قَالَ مَرَرْتُ عَلَى أَبِي ذَرٍّ بِالرَّبَذَةِ فَقُلْتُ مَا أَنْزَلَكَ بِهَذِهِ الأَرْضِ قَالَ كُنَّا بِالشَّأْمِ فَقَرَأْتُ ‏{‏وَالَّذِينَ يَكْنِزُونَ الذَّهَبَ وَالْفِضَّةَ وَلاَ يُنْفِقُونَهَا فِي سَبِيلِ اللَّهِ فَبَشِّرْهُمْ بِعَذَابٍ أَلِيمٍ‏}‏ قَالَ مُعَاوِ…

Narrated Zaid bin Wahb: I passed by (visited ) Abu Dhar at Ar-Rabadha and said to him, "What has brought you to this land?" He said, "We were at Sham and I recited the Verse: "They who hoard up gold and silver and spend…