Musnad Ahmad 1153:267

Yahya narrated to us, from Mujalid, who said: Amir narrated to me, from Masruq, who said: I said to Aisha: "Did the Messenger of Allah, peace and blessings of Allah be upon him, say anything when he entered the house?" She said: "When he entered the house, he would recite: 'If the son of Adam had two valleys of wealth, he would seek a third valley, and nothing fills his mouth except dust. And We did not make wealth except for the establishment of prayer and the giving of zakat, and Allah accepts the repentance of whoever repents.'"