The Muslims used to be eager to march out on military expeditions with the Messenger of Allah ﷺ, so they would hand over their keys to those they entrusted with their property, telling them, "We have permitted you to eat whatever you wish from our homes." But those entrusted would say, "It is not lawful for us to eat from it, for they only granted permission without genuine willingness." So Allah revealed, "There is no blame upon the blind, nor any blame upon the lame, nor any blame upon the sick, nor upon yourselves if you eat from your own houses or the houses of your fathers" up to His saying, "or those whose keys you possess, or those of your friends" [Nur 24:61].
كان المسلمون يرغبون في النفير مع رسول الله ﷺ، فيدفعون مفاتيحهم إلى ضمنائهم، ويقولون لهم: قد أحللنا لكم أن تأكلوا ما أحببتم، فكانوا يقولون: إنه لا يحل لنا، إنهم أذنوا عن غير طيب نفس، فأنزل الله عز وجل: {ليس على الأعمى حرج ولا على الأعرج حرج ولا على المريض حرج ولا على أنفسكم أن تأكلوا من بيوتكم أو بيوت ابائكم} إلى قوله: {أو ما ملكتم مفاتحه أو صديقكم}
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Bazzar narrated it in Kashf Astar (2241), and Ibn Abu Hatim in his Tafsir (8/2646), both through Ibrahim bin Saad, from Salih bin Kaysan, from Ibn Shihab, from Urwa bin Zubayr, from Ayesha, who said, and then she mentioned it. Its chain of transmission is sahih. Ibn Hajar likewise graded it sahih in "Mukhtasar Zawaid Musnad Bazzar" (2/97).As for the statement, "There is no blame on you whether you eat together or separately" [Nur 24:61], this is a permission from Allah for a man to eat alone or to eat with a group, though eating with the group is better.