Some chicken was brought to Abu Musa and a man moved away from the people. He said: "What is the matter with you?" He said: "I saw it eating something that I consider filthy, and I swore I would not eat it." Abu Musa said: "Come and eat, for I saw the Messenger of Allah eating it." And he told him to offer an expiation for his vow (Kafarat Al-Yamin)
أَنَّ أَبَا مُوسَى أُتِيَ بِدَجَاجَةٍ فَتَنَحَّى رَجُلٌ مِنَ الْقَوْمِ فَقَالَ مَا شَأْنُكَ قَالَ إِنِّي رَأَيْتُهَا تَأْكُلُ شَيْئًا قَذِرْتُهُ فَحَلَفْتُ أَنْ لاَ آكُلَهُ فَقَالَ أَبُو مُوسَى ادْنُ فَكُلْ فَإِنِّي رَأَيْتُ رَسُولَ اللَّهِ ﷺ يَأْكُلُهُ وَأَمَرَهُ أَنْ يُكَفِّرَ عَنْ يَمِينِهِ