Musannaf Ibn Abi Shayba 3:4078

Waki’ narrated to us, from Sufyan, from Mansur, from Hilal ibn Yasaf, from Damra ibn Habib, from a man among the companions of the Prophet, may Allah bless him and grant him peace, who said: The voluntary prayer of a man in his house exceeds his voluntary prayer among the people, like the excellence of a man’s prayer in congregation over his prayer alone.