That the Messenger of Allah ﷺ said: "If the people knew what I know about being alone, then a rider would not journey at night." - meaning alone. (Using translation from Tirmidhī 1673)
عَنِ النَّبِيِّ ﷺ قَالَ «لَوْ يَعْلَمُ النَّاسُ مِنَ الْوَحْدَةِ مَا أَعْلَمُ مَا سَارَ رَاكِبٌ وَحْدَهُ بِلَيْلٍ»