Salim bin Abdullah reported that Abdullah bin Umar used to send the weaker members of his household ahead. They would stop at al-Mashar al-Haram in Muzdalifa during the night, remembering Allah as much as they wished, then move on before the imam took his position and before he departed. Some of them would arrive at Mina in time for the dawn prayer, while others would arrive after that. Once they arrived, they would stone the Jamrah.Ibn Umar used to say, "The Messenger of Allah ﷺ granted them this concession."
أن سالم بن عبد الله أخبره: أن عبد الله بن عمر كان يقدم ضعفة أهله، فيقفون عند المشعر الحرام بالمزدلفة بالليل فيذكرون الله ما بدا لهم، ثم يدفعون قبل أن يقف الإمام، وقبل أن يدفع فمنهم من يقدم منى لصلاة الفجر، ومنهم من يقدم بعد ذلك، فإذا قدموا رموا الحمرة. وكان ابن عمر يقول: أرخص في أولئك رسول الله ﷺ.