Zayd ibn Thabit reported that 'Umar ibn al-Khattab came to him to ask to see him one day and he gave him permission while his head was in the hands of a slavegirl of his who was combing his hair. He removed his head and 'Umar said to him, 'Let her comb it.' He said, 'Amir al-Mu'minin, if you were to send for me, I would come to you.' ''Umar said, 'It is my need.'"