Musnad Abu Ya'la al-Mawsili 107:14

Abu Abdullah al-Dawraqi narrated to us, Abu Abd al-Rahman narrated to us, Ibn Lahi'ah narrated to us, he said: Abu Qubayl al-Ma'afiri narrated to me, from Abu 'Ashanah al-Ma'afiri, from Uqbah ibn Amir al-Juhani, from the Prophet (peace and blessings of Allah be upon him), who said: "Whoever leaves his house for the mosque, ten good deeds are written for him for every step he takes. And the one sitting in the mosque waiting for the prayer is like the devoutly obedient, and he is recorded among those who pray until he returns to his house."