It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever leads a blind person until he brings him to his place of safety, Allah Almighty will forgive him forty major sins, and also four major sins which make the Fire obligatory."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12886