Mishkat al-Masabih 19 Jihad كتاب الجهاد 122

وَعَنْ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «الرَّاكِبُ شَيْطَانٌ وَالرَّاكِبَانِ شَيْطَانَانِ وَالثَّلَاثَةُ رَكبٌ» . رَوَاهُ مالكٌ وَالتِّرْمِذِيّ وَأَبُو دَاوُد وَالنَّسَائِيّ

‘Amr b. Shu’aib, on his father’s authority, told that his grandfather reported God’s Messenger as saying, “A single rider is a devil and a pair of riders are a pair of devils, but three are a company of riders.” Malik, Tirmidhi, Abu Dawud and Nasa’i transmitted it.