Sahih Muslim
The Book of Virtue, Good Manners and Joining of the Ties of Relationship (Kitab Al-Birr was-Salat-I-wal-Adab)
Book Number: 032 / Hadith Number: 6239
'A'isha reported Allah's Messenger (may peace be upon him) as saying: A believer does not undergo (the trouble) of running a thorn or more than that when Allah effaces his sins.