Musannaf Ibn Abi Shayba 3:5923

Ibn ‘Ulayyah and Ibn Numayr narrated to us, from Sufyan, from Habib, from Tawus, from Ibn ‘Abbas, they both said: We prayed with the Messenger of Allah, may Allah bless him and grant him peace, during the solar eclipse, eight rak'ahs in four prostrations.