Musnad Abu Ya'la al-Mawsili 154:67

Abu Bakr ibn Abi Shaybah narrated to us, Abu Mu'awiyah narrated to us, from Bashar ibn Kaddam, from Muhammad ibn Zayd, from Ibn Umar, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "The oath is either a violation or a regret."