It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that Quraysh said to the Prophet (peace and blessings be upon him): "Pray to your Lord to turn (the mount of) Safa into gold for us, and we will believe in you." He (peace and blessings be upon him) asked: "Will you do so?" They said: "Yes." So he (peace and blessings be upon him) prayed. Then Jibril (peace be upon him) came to him and said: "Allah Almighty sends you greetings of peace and says: If you wish, Safa will become gold, but whoever disbelieves after that, I will punish him with a punishment with which I have not punished anyone among all the worlds; and if you wish, I will open for them the door of repentance and mercy." He (peace and blessings be upon him) said: "Rather, the door of repentance and mercy." This hadith has a sahih (authentic) chain, and they (the two Shaykhs) did not record it.