Musnad Ahmad 483:6

Abu al-Mughirah narrated to us, Sa'id ibn 'Abd al-'Aziz narrated to us, Sulayman ibn Musa narrated to us, from Zayd ibn Jariyah, from Habib ibn Maslamah, who said: "I witnessed the Messenger of Allah, may Allah bless him and grant him peace, grant the extra third after the fifth."