Hadith 8:2966
Abu Bakr narrated to us, he said: Abu Usamah narrated to us, from Ubaydullah, from Nafi’, from Ibn Umar: That he removed his shirt during the year of the tribulation (fitna), then he pronounced the talbiyah, and he did not perform ghusl.
حدثنا أبو بكر قال نا أبو أسامة عن عبيد الله عن نافع عن بن عمر أنه نزع قميصه عام الفتنة ثم لبى ولم يغتسل