Musnad Ahmad 535:12

Hajjaj narrated to us, from Ibn Lahi'ah, and Abu Zakariya said: Ibn Lahi'ah informed us, from Ubayd Allah ibn al-Mughirah, who said: I heard Abdullah ibn al-Harith ibn Juz' al-Zubaydi saying: "I never saw the Messenger of Allah, may Allah bless him and grant him peace, except smiling."