Musnad Abu Ya'la al-Mawsili 153:173

Sarih ibn Yunus narrated to us, Abu Mu'awiyah narrated to us, Bashar ibn Kaddam narrated to us, from Muhammad ibn Zayd ibn Abdullah ibn Umar, from Ibn Umar, who said: The Prophet, may Allah bless him and grant him peace, said: "Verily, the oath is either a violation or regret."