The Prophet ﷺ urinated and Umar was standing behind him with a jug of water. He said: What is this, Umar? He replied: Water for you to perform ablution with. He said: I have not been commanded to perform ablution every time I urinate. If I were to do so, it would become a sunnah. (Using translation from Abū Dāʾūd 42)   

أَنَّ النَّبِيَّ ﷺ بَالَ فَأَتَاهُ عُمَرُ بِكُوزٍ مِنْ مَاءٍ فَقَالَ مَا هَذَا يَا عُمَرُ؟ قَالَ تَوَضَّأْ بِهِ قَالَ لَمْ أُومَرْ كُلَّمَا بُلْتُ أَنْ أَتَوَضَّأَ وَلَوْ فَعَلْتُ كَانَتْ سُنَّةً لَفْظُ حَدِيثِ فَهْدِ بْنِ حَيَّانَ  

[Machine] It was narrated that when the Prophet ﷺ saw a scorpion, he would mention it and say, "Abdullah bin 'Adi narrated from Isa bin Yazdad, from his father, that Zam'ah bin Salih said: 'I heard Ibn Hammad mention it from Al-Bukhari.' Abdullah was also known as Isa bin Azdad and this hadith is only known through him."  

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا بَالَ نَتَرَ ذَكَرَهُ ثَلَاثَ نَتَرَاتٍ قَالَ عَبْدُ اللهِ بْنُ عَدِيٍّ عِيسَى بْنُ يَزْدَادَ عَنْ أَبِيهِ مُرْسَلٌ رَوَى عَنْهُ زَمْعَةُ بْنُ صَالِحٍ لَا يَصِحُّ سَمِعْتُ ابْنَ حَمَّادٍ يَذْكُرُهُ عَنِ الْبُخَارِيِّ قَالَ عَبْدُ اللهِ وَقِيلَ عِيسَى بْنُ ازْدَادَ لَا يُعْرَفُ إِلَّا بِهَذَا الْحَدِيثِ