Narrator:Abdullah ibn Mas‘ūd
وَعَنِ ابْنِ مَسْعُودٍ - رضى الله عنه - قَالَ: { أَتَى اَلنَّبِيُّ - صلى الله عليه وسلم -اَلْغَائِطَ, فَأَمَرَنِي أَنْ آتِيَهُ بِثَلَاثَةِ أَحْجَارٍ, فَوَجَدْتُ حَجَرَيْنِ, وَلَمْ أَجِدْ ثَالِثًا. فَأَتَيْتُهُ بِرَوْثَةٍ. فَأَخَذَهُمَا وَأَلْقَى اَلرَّوْثَةَ, وَقَالَ:
"هَذَا رِكْسٌ"
Narrated Ibn Mas’ud (rad):
The Prophet (ﷺ) went out to answer the call of nature and asked me to bring three stones. I found two stones and searched for the third but could not find it. So I took a dried piece of dung and brought it to him. He took the two stones and threw away the dung and said, “This is a filthy thing”. [Reported by Al-Bukhari]
Cited in Bulugh al-Maram (No. 101).