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: 6339
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: While a person was going along the path he found a thorny branch upon it. He pushed it to a side and Allah approved (this action) of his and (as a mark of appreciation) granted him pardon.