It was narrated from Abu Hurairah that the Prophet ﷺ performed Wudu', and when he had performed Istinja' he rubbed his hand on the ground.  

أَنَّ النَّبِيَّ ﷺ تَوَضَّأَ فَلَمَّا اسْتَنْجَى دَلَكَ يَدَهُ بِالأَرْضِ  

"I was with the Prophet ﷺ and he went to Al Khala' (toilet) and relieved himself, then he said: "O Jarir, bring Tahur (a means of purification)." So I brought him some water and he performed Intinja' with water, and did like this with hand, rubbing it on the ground. Abu 'Abdur-Rahman (An-Nasa'i) said: "This resembles more with what is correct than the (previous) narration of Sharik, and Allah knows best."  

كُنْتُ مَعَ النَّبِيِّ ﷺ فَأَتَى الْخَلاَءَ فَقَضَى الْحَاجَةَ ثُمَّ قَالَ يَا جَرِيرُ هَاتِ طَهُورًا فَأَتَيْتُهُ بِالْمَاءِ فَاسْتَنْجَى بِالْمَاءِ وَقَالَ بِيَدِهِ فَدَلَكَ بِهَا الأَرْضَ قَالَ أَبُو عَبْدِ الرَّحْمَنِ هَذَا أَشْبَهُ بِالصَّوَابِ مِنْ حَدِيثِ شَرِيكٍ وَاللَّهُ سُبْحَانَهُ وَتَعَالَى أَعْلَمُ