It was narrated from 'Aishah that the Messenger of Allah (ﷺ) said:"When any one of you goes to the Gha'it (toilet to defecate), let him take with him three stones and clean himself with them, for that will suffice him."
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ أَبِي حَازِمٍ، عَنْ أَبِيهِ، عَنْ مُسْلِمِ بْنِ قُرْطٍ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا ذَهَبَ أَحَدُكُمْ إِلَى الْغَائِطِ فَلْيَذْهَبْ مَعَهُ بِثَلاَثَةِ أَحْجَارٍ فَلْيَسْتَطِبْ بِهَا فَإِنَّهَا تَجْزِي عَنْهُ " .
Nesai
The Book of Purification • Hadith 44