Mishkat al-Masabih
Purification — Hadith #357
عَنِ ابْنِ عُمَرَ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ:
" أَرَانِي فِي الْمَنَامِ أَتَسَوَّكُ بِسِوَاكٍ فَجَاءَنِي رَجُلَانِ أَحَدُهُمَا أَكْبَرُ مِنَ الْآخَرِ فَنَاوَلْتُ السِّوَاكَ الْأَصْغَرَ مِنْهُمَا فَقِيلَ لي: كبر فَدَفَعته إِلَى الْأَكْبَر مِنْهُمَا "
Ibn ‘Umar reported the Prophet as saying, “I had a dream in which I was using a tooth-stick, when two men, one older than the other, came to me. I handed the tooth-stick to the younger of the two and was told to respect the senior, so I handed it to the older.”
(Bukhari and Muslim.)