عَنْ عَامِرِ بْنِ رَبِيعَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ مَا لَا أَعُدُّ وَلَا أُحْصِي يَسْتَاكُ وَهُوَ صَائِمٌ
It is narrated from Sayyiduna ‘Amir bin Rabi‘ah (may Allah be pleased with him), he says: “I have seen the Messenger of Allah (peace and blessings be upon him) using the miswak while fasting countless and innumerable times.”