Narrated Ibn Abbaas (radiyallaahu anhumaa): The Quraish said to the Prophet (sallal-laahu-alayhi wasallam): ”Invoke your Lord to bring forth for us a mountain of gold and we shall believe in you.” He (sallal-laahu-alayhi-wasallam) said (to them): “Will you do so?” They said, “Yes”. He (sallal-laahu-alayhi wasallam) invoked (Allaah), so Jibreal came to him and said: “Indeed, your Lord conveys His peace and blessings upon you and He says: “If you wish there will be a mountain of gold for them and whoever amongst them disbelieves after that, then I will punish him with a punishment such as I have not inflicted on anyone among all (mankind and Jinn); and if you wish I will open for them the door of repentance and mercy.” He (sallal-laahu-alayhi-wasallam) said: ”Rather (open for them) the door of repentance and mercy.”
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[Declared authentic by Imaam Al Albaani in Saheeh At-Targheeb Wat-Tarheeb 3142]