Al-Kāfi - Volume 4 > Disciplines to Maintain in the State of al-’Ihram
Hadith #12

12ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ أَحْمَدَ عَنْ أَحْمَدَ بْنِ الْحَسَنِ عَنْ عَمْرِو بْنِ سَعِيدٍ عَنْ مُصَدِّقِ بْنِ صَدَقَةَ عَنْ عَمَّارِ بْنِ مُوسَى عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) قَالَ سَأَلْتُهُ عَنِ الْمُحْرِمِ يَكُونُ بِهِ الْجَرَبُ فَيُؤْذِيهِ قَالَ يَحُكُّهُ فَإِنْ سَالَ مِنْهُ الدَّمُ فَلا بَأْسَ.

12. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ahmad ibn al-Hassan from ‘Amr ibn Sa‘id from Musaddiq ibn Sadaqah from ‘Ammar ibn Musa who has said the following: “I once asked abu ‘Abd Allah, ‘Alayhi al-Salam, about a man who is in the state of Ihram and has itches that irritate him. He (the Imam) said, ‘He can scratch it and if it bleeds it is not harmful.’”