Musnad Ahmad 1129:13

'Ali ibn 'Abdullah narrated to us before he was tested, Mulazim ibn 'Amr narrated to us, Hawdhah ibn Qays ibn Talq narrated to me, from his father Qays ibn Talq, from his grandfather Talq ibn 'Ali, who said: "When we used to pray with the Prophet of Allah, may Allah bless him and grant him peace, we would see the whiteness of his right cheek and the whiteness of his left cheek."