Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates from the Prophet (peace and blessings be upon him): "If the son of Adam had two valleys of gold, he would seek another like them; nothing fills the belly of the son of Adam but dust, and Allah Almighty turns in forgiveness to whoever repents." Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: I do not know whether this is from the Qur'an or not. It has been narrated to us from Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) that they used to consider it part of the Qur'an until these verses were revealed: "The abundance of wealth has destroyed (preoccupied) you, until you visited the graves" [Surah al-Takathur: 1], that is, until you died.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6508