Mishkat al-Masabih 7 Fasting كتاب الصوم 46

وَعَنِ ابْنِ عَبَّاسٍ قَالَ: إِنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ احْتَجَمَ وَهُوَ مُحْرِمٌ وَاحْتَجَمَ وَهُوَ صَائِمٌ

Ibn ‘Abbas said that the Prophet had himself cupped when he was wearing the ihram and also when he was fasting. (Bukhari and Muslim.)