Sahih Bukhari
To make the Heart Tender (Ar-Riqaq)
Volume: 008 / Book Number: 076 / Hadith Number: 447
Narrated Anas bin Malik:
Allah's Apostle said, "If Adam's son had a valley full of gold, he would like to have two valleys, for nothing fills his mouth except dust. And Allah forgives him who repents to Him."