ENOfficial
Anas reported God's messenger as saying, "The least of the signs of the last hour will be a fire which will gather mankind from the East to the West." Bukhari transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَنَسٍ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَوَّلُ أَشْرَاطِ السَّاعَةِ نَارٌ تَحْشُرُ النَّاسَ مِنَ الْمَشْرِقِ إِلَى الْمَغْرِبِ» . رَوَاهُ الْبُخَارِيُّ
sunnah.com