Musnad Abu Ya'la al-Mawsili 112:34

Muhammad ibn Bahr narrated to us, Abd al-Rahim ibn Zayd al-Ammi narrated to us, from his father, from al-Hasan, from Anas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever walks to fulfill a need for his Muslim brother, Allah writes for him, for every step he takes, a good deed, until he returns from where he departed. If his need is fulfilled, he exits his sins like the day his mother gave birth to him. And if he perishes while in that state, he enters Paradise without reckoning."