Sayyiduna Utbah bin Abd (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) saying: "Any servant who leaves his house in the morning or the evening for the mosque, one of his steps is an expiation and one step is a good deed."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14393