Hadith 8:2312
Abu Bakr narrated to us, he said: Asbat bin Muhammad narrated to us, from ‘Amr bin Maymun, from his father, from ‘Abdullah bin ‘Umar, he said: A man asked me, "May I scratch my head while I am in the state of Ihram?" He said, "If you wish." He said, "I scratched it and a louse fell from it, and I looked for it but did not find it." He said, "A lost item that is not found."
حدثنا أبو بكر قال حدثنا أسباط بن محمد عن عمرو بن ميمون عن أبيه عن عبد الله بن عمر قال سالني رجل أحك رأسي وأنا محرم قال إن شئت قال إني حككته فوقعت منه قملة فطلبتها ولم أجدها قال ضالة لا توجد