Hadith 17:530
Waki’ narrated to us, from ‘Imran, from Abu Mijlaz, who said: When Ibn ‘Umar would seek permission [to enter] and it was said to him, "Enter in peace," he would turn back. He said, "I do not know whether I am entering in peace or not in peace."
حدثنا وكيع عن عمران عن أبي مجلز قال كان بن عمر إذا استأذن فقيل له ادخل بسلام رجع قال لا أدري أدخل بسلام أو بغير سلام