Narrated Abu Huraira (may Allah be pleased with him): The Prophet (peace and blessings of Allah be upon him) said, "People will be gathered in three groups: (one group will be) those who will be walking, having desire and fear; (the second group will be) those who will be riding, two persons on a camel, three on a camel, four on a camel, and ten on a camel; and the rest of the people will be gathered by the Fire (this third group will be the people of shirk). When they take a nap, the Fire will stay with them; when they spend the night, the Fire will stay with them; when they wake up in the morning, the Fire will be present with them in the morning; and when they spend the evening, the Fire will be present with them in the evening."
Hadith Takhrij«صحیح، أخرجه البخاري في: 81 كتاب الرقاق: 45 باب كيف الحشر»
Brief Explanation
The scholars of Islam have interpreted this fire to refer to several fiery incidents. As for the true reality, only Allah the Exalted knows best. Our belief is that whatever the Messenger of Allah (sallallahu alayhi wa sallam) has said is true. (Secret)