The Prophet ﷺ gave permission to the weak among the people to leave Muzdalifa at night.
أن النبي ﷺ أذن لضعفة الناس من المزدلفة بليل.
Ahmad (4892) and Nasai in Al-Kubra (4037) both narrated it from the hadith of Abdul-Razzaq, who said, Mamar informed us, from Zuhri, from Salim, from Ibn Umar, and he mentioned it. Its isnad is sahih.