Sahih Muslim | Book 35 | Hadith Number 6517
Narrated by Mus'ab b. Sa'd
Mus'ab b. Sa'd reported that his father told him that he had been in the company of Allah's Messenger (may peace be upon him) that he said: Is one amongst you powerless to get one thousand virtues every day. Amongst those who had been sitting there, one asked: How one amongst us can get one thousand virtues every day? He said: Recite: "Hallowed be Allah" one hundred times for (by reciting them) one thousand virtues are recorded (to your credit) and one thousand vices are blotted out.