Musnad Ahmad 27:1099

'Abd al-Samad and Abu Sa'id narrated to us, they said: 'Abd Allah ibn al-Muthanna narrated to us, 'Abd Allah ibn Dinar narrated to us, from Ibn 'Umar, who said: "The Messenger of Allah, may Allah bless him and grant him peace, forbade *al-qaza'*." 'Abd al-Samad said: "And it is the patch on the head."