When Bakr (rahimahullaah) used to see an old man, he would say: ”This (person) is better than me. He worshipped Allaah before me.”  And if he saw a youth, he would say: ”This (person) is better than me. I have committed more sins than he has committed.”

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[Siyar A’laam An-Nubulaa 4/535]