Sahih al-Bukhari 6719

Arabic

حَدَّثَنَا أَبُو النُّعْمَانِ، حَدَّثَنَا حَمَّادٌ، وَقَالَ، ‏"‏ إِلاَّ كَفَّرْتُ يَمِينِي، وَأَتَيْتُ الَّذِي هُوَ خَيْرٌ ‏"‏‏.‏ أَوْ ‏"‏ أَتَيْتُ الَّذِي هُوَ خَيْرٌ، وَكَفَّرْتُ ‏"‏‏.‏

English translation

Narrated Hammad:the same narration above (i.e. 709), "I make expiation for my dissolved oath, and I do what is better, or do what is better and make expiation

Reference: Sahih al-Bukhari 6719, Book of Expiation for Unfulfilled Oaths. English translation by Dr. Muhammad Muhsin Khan.