If someone does something against his oath due to forgetfulness
حَدَّثَنَا خَلاَّدُ بْنُ يَحْيَى، حَدَّثَنَا مِسْعَرٌ، حَدَّثَنَا قَتَادَةُ، حَدَّثَنَا زُرَارَةُ بْنُ أَوْفَى، عَنْ أَبِي هُرَيْرَةَ، يَرْفَعُهُ قَالَ " إِنَّ اللَّهَ تَجَاوَزَ لأُمَّتِي عَمَّا وَسْوَسَتْ أَوْ حَدَّثَتْ بِهِ أَنْفُسَهَا، مَا لَمْ تَعْمَلْ بِهِ أَوْ تَكَلَّمْ ".
Narrated Abu Huraira: The Prophet (ﷺ) said, "Allah forgives my followers those (evil deeds) their souls may whisper or suggest to them as long as they do not act (on it) or speak."