What one who is in the Sacred State must avoid - Section 1 Mishkat al-Masabih 2684
Arabic hadith text
وَعَن أَبِي أَيُّوبَ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ يَغْسِلُ رَأْسَهُ وَهُوَ مُحْرِمٌ
Translation
Abu Ayyub said that the Prophet used to wash his head when he was in the sacred state.Bukhari and Muslim.