The Messenger of Allah ﷺ as saying: None of you should walk with one sandal, but should wear a pair or should put off both of them.
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَمْشِي أَحَدُكُمْ فِي النَّعْلِ الْوَاحِدَةِ لِيَنْتَعِلْهُمَا جَمِيعًا أَوْ لِيَخْلَعْهُمَا جَمِيعًا