Warning against hoarding wealth

It is narrated from Abu Mijlaz (may Allah have mercy on him) that once he (the narrator is referring to the Prophet (peace and blessings be upon him)) stood and, delivering an address, said: "Those who hoard purses of wealth (the hoarders) have perished, and I feel no sorrow for them; rather, my grief is for those over whom you pray." Then, as soon as he came down from the pulpit, the Companions, out of awe of him, held back from asking him (for an explanation) and began discussing among themselves: Whom do you think he meant by this? They said: We think it refers to a people who will come after us, who will gather up and hoard this wealth and shed blood unjustly for its sake.
I (Ibn Hajar) say: What is correct and preserved (mahfuz) in transmission is that this address actually belongs to Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him).

Abdullah bin Buraydah narrates from his father (Sayyiduna Buraydah bin al-Husayb, may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whenever any people withheld the payment of zakah, Allah Almighty most certainly withheld the rain from them."
The chain of this hadith is hasan (good). Imam al-Ruyani also narrated it through his own chain, but his narration does not contain the word 'qatt' (ever), and there 'hubisa' (the rain was withheld) is transmitted in the passive form. Imam Abu Ya'la also narrated it, and his text is more detailed and complete than this.

It is narrated from Sayyiduna Thawban (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever leaves behind him a treasure, on the Day of Resurrection that treasure will be made to appear in the form of a highly venomous bald serpent with two black marks over its eyes. That serpent will pursue that man, and he will ask (in alarm): Who are you? It will say: I am that very treasure of yours which you left behind you. So it will keep following him until that man (trying to save himself) puts his hand into its mouth, and it will begin to chew it; then it will take hold of the rest of his entire body as well."
Imam al-Bazzar (may Allah have mercy on him) states that we do not know any other route for this hadith narrated from Sayyiduna Thawban (may Allah be pleased with him) besides this chain.