[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  

[Machine] The Messenger of Allah ﷺ said, "Perform istinja' (cleansing after using the toilet) with three stones or with earth if there are no stones available, and if there is nothing with which to perform istinja' that has been used before." Abu Ahmad ibn 'Adiyy al-'Aammatu said, "Most of what Ibrahim ibn Abi Humaid narrates is not followed by anyone."  

قَالَ رَسُولُ اللهِ ﷺ الِاسْتِنْجَاءُ بِثَلَاثَةِ أَحْجَارٍ وَبِالتُّرَابِ إِذَا لَمْ يَكُنْ يَجِدْ حِجَارَةً وَلَا يَسْتَنْجِي بِشَيْءٍ قَدِ اسْتُنْجِيَ بِهِ مَرَّةً قَالَ أَبُو أَحْمَدَ بْنُ عَدِيٍّ عَامَّةُ مَا رَوَى إِبْرَاهِيمُ بْنُ أَبِي حُمَيْدٍ هَذَا لَا يُتَابِعُهُ عَلَيْهِ أَحَدٌ