Abdullah bin Umar used to pray in the masjid at Dhul-Hulayfa, then he would go out and mount his camel, and once his mount stood up straight with him, he would enter the state of consecration.
و حدثني عن مالك
أن عبد الله بن عمر كان يصلي في مسجد ذي الحليفة ثم يخرج فيركب فإذا استوت به راحلته أحرم