From Sahih Muslim (Hadith 3130):
Salim b. 'Abdullah reported that 'Abdullah b. 'Umar (Allah be pleased with them) used to send ahead of him the weak members of his household to stay during the night at Mash'ar al-Haram at Muzdalifa. They remembered Allah so long as they could afford, and then they proceeded before the stay of the Imam, and before his return. So some of them reached Mina for the dawn prayer and some of them reached there after that; and as they reached there, they stoned al-Jamra; and Ibn 'Umar (Allah be pleased with them) used to say:Allah's Messenger (ﷺ) has granted this concession to them
Reference: Muslim 3130