Mishkat al-Masabih 3 Purification كتاب الطهارة 128

وَعَنْ عَبْدِ اللَّهِ بْنِ زَيْدٍ قَالَ: إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ تَوَضَّأ مَرَّتَيْنِ مَرَّتَيْنِ وَقَالَ: هُوَ «نُورٌ عَلَى نُورٍ»

‘Abdallah b. Zaid said that God’s messenger performed the details of ablution twice each, and said, “It was a light upon a light.”