[Machine] The Messenger of Allah ﷺ said, "The Istinja' (cleansing after using the bathroom) is done with three stones or with earth if a stone is not found. And one should not perform Istinja' with something that has already been used for Istinja' once." Uthman al-Tarayfi spoke about it and narrated it from an unknown group of people. And Allah knows best. And it was also narrated from another perspective by Anas, but its authenticity is not confirmed.  

قَالَ رَسُولُ اللهِ ﷺ الِاسْتِنْجَاءُ بِثَلَاثَةِ أَحْجَارٍ وَبِالتُّرَابِ إِذَا لَمْ يَجِدْ حَجَرًا وَلَا يُسْتَنْجَى بِشَيْءٍ قَدِ اسْتُنْجِيَ بِهِ مَرَّةً عُثْمَانُ الطَّرَائِفِيُّ تَكَلَّمُوا فِيهِ وَيَرْوِي عَنْ قَوْمٍ مَجْهُولِينَ وَاللهُ أَعْلَمُ وَرُوِيَ مِنْ وَجْهٍ آخَرَ عَنْ أَنَسٍ وَلَا يَصِحُّ