Musnad Ahmad 1034:59

Isma'il ibn 'Umar and Khalaf ibn al-Walid narrated to us, they said: Yahya ibn Zakariyya—meaning Ibn Abi Za'idah—narrated to us, from 'Ikrimah ibn 'Ammar, from Muhammad ibn 'Abd Allah al-Du'ali, who said: 'Abd al-'Aziz, the brother of Hudhayfah, said: Hudhayfah said: "Whenever a matter distressed the Messenger of Allah, may Allah bless him and grant him peace, he would pray."