ENOfficial
Abu Huraira reported the Prophet (ﷺ) as saying, "The dajjal will come forth on a white ass with a space seventy times as wide as one can stretch between its ears." Baihaqi transmitted it in Kitab al-ba`th wan nushur
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «يَخْرُجُ الدَّجَّالُ عَلَى حِمَارٍ أَقْمَرَ مَا بَيْنَ أُذُنَيْهِ سَبْعُونَ بَاعًا» . رَوَاهُ الْبَيْهَقِيُّ فِي «كِتَابِ الْبَعْثِ وَالنُّشُورِ»
sunnah.com