عَنْ مُحَمَّدِ بْنِ عَمْرِو بْنِ عَطَاءٍ قَالَ: رَأَيْتُ السَّائِبَ بْنَ خَبَّابٍ رَضِيَ اللَّهُ عَنْهُ يَشُمُّ ثَوْبَهُ، فَقُلْتُ لَهُ: مِمَّ ذَلِكَ؟ فَقَالَ: إِنِّي سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَقُولُ: ((لَا وَضُوءَ إِلَّا مِنْ رِيحٍ أَوْ سَمَاعٍ))
Muhammad bin Amr says: I saw Sayyiduna Saib bin Khabbab (may Allah be pleased with him) smelling his garment. I asked: Why are you doing this? He said: I heard the Messenger of Allah (peace and blessings be upon him) say: Wudu is only required due to a bad smell or hearing the sound of wind.