وَٱلَّذِينَ يَكْنِزُونَ ٱلذَّهَبَ وَٱلْفِضَّةَ وَلَا يُنفِقُونَهَا فِى سَبِيلِ ٱللَّهِ فَبَشِّرْهُم بِعَذَابٍ أَلِيمٍ

And those who hoard gold and silver and spend it not in the way of Allah - give them tidings of a painful punishment. Al Tawba (Immunity) - 34

A hadith from Ali about Allah's statement, "And those who hoard up gold and silver and spend them not in the way of Allah..." Ali said that the Prophet said, “Woe to gold! Woe to silver.” He repeated this statement thrice, and this hadith was hard on the companions of the Messenger of Allah, who said, “What type of wealth should we use?” `Umar said, “I will find out for you,” and he asked, “O Messenger of Allah! Your statement was hard for your companions. They asked, ‘What wealth should we use?’” The Prophet answered, “A remembering tongue, an appreciative heart and a wife that helps one of you implement his religion.”

عَنْ عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ قَالَ:

قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: "وَيْلٌ لِلذَّهَبِ وَيْلٌ لِلْفِضَّةِ" ثُمَّ أَعَادَ ذَلِكَ ثَلاثًا، فَكَانَ ذَلِكَ شَدِيدًا عَلَى أَصْحَابِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ.

فَقَالُوا: "مَا نِعْمَةُ نَتَعَامَلُ بِهَا؟"

قَالَ عُمَرُ رَضِيَ اللَّهُ عَنْهُ: "أَبِينُ لَكُمْ".

فَقَالَ: "يَا رَسُولَ اللَّهِ إِنَّ قَوْلَكَ كَانَ شَدِيدًا عَلَى أَصْحَابِكَ".

فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: "لِسَانٌ ذَاكِرٌ، وَقَلْبٌ شَاكِرٌ، وَزَوْجَةٌ تُعِينُ أَحَدَكُمْ عَلَى دِينِهِ".

A hadith from Thawban that the Messenger of Allah used to declare, “Whoever leaves a treasure behind (on which he did not pay the Zakah), then on the Day of Resurrection his wealth will be made like a bald-headed poisonous male snake with two black spots over the eyes. The snake will follow him, and he will say, ‘Woe to you! Who are you?’ The snake will say, ‘I am your treasure that you left behind,’ and will keep following him until the man gives it his hand; the snake will devour it and then devour his whole body.”