Hadith 8:128
Abu Bakr narrated to us, he said: Abd al-A’la narrated to us, from Hisham, from al-Hasan and ‘Ata’, they said: There is no harm in the use of the miswak for the one in the state of ihram.
حدثنا أبو بكر قال ثنا عبد الأعلى عن هشام عن الحسن وعطاء قال لابأس بالسواك للمحرم