Sahih Muslim 2966
Sahih Muslim · Book 55: The Book of Zuhd and Softening of Hearts
This hadith has been narrated on the authority of Isma'il b. Khalid with the same chain of transmitters and the words are:
وَحَدَّثَنَاهُ يَحْيَى بْنُ يَحْيَى ، أَخْبَرَنَا وَكِيعٌ ، عَنْ إِسْمَاعِيلَ بْنِ أَبِي خَالِدٍ ، بِهَذَا الإِسْنَادِ وَقَالَ حَتَّى إِنْ كَانَ أَحَدُنَا لَيَضَعُ كَمَا تَضَعُ الْعَنْزُ مَا يَخْلِطُهُ بِشَىْءٍ .
" One amongst us would relieve himself as the goats do without anything mixing with its excrement."