Musnad Ahmad 333:13

'Abd al-Razzaq narrated to us, he said: Ibn Jurayj informed us, he said: 'Amr ibn Dinar informed me, from Hasan ibn Muhammad ibn 'Ali, from Jabir ibn 'Abd Allah and Salamah ibn al-Akwa', a man from the companions of the Messenger of Allah, may Allah bless him and grant him peace, that they both said: We were on a military expedition, and the messenger of the Messenger of Allah, may Allah bless him and grant him peace, came to us and said: "The Messenger of Allah, may Allah bless him and grant him peace, says: 'Seek enjoyment (mut'ah).'"