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.
Sunan an-Nasa'i Book 1, Hadith 50
← Previous Hadith "The idolators said: 'We see that your companion teaches you how to go to the toilet.' He said: 'Yes, he forbade us from cleaning ourselves with our right hand, and from facing toward the Qiblah, and he said: 'None of you should clean with less than three stones.'"

Sunan an-Nasa'i Book 1, Hadith 49 Next Hadith → "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."

Sunan an-Nasa'i Book 1, Hadith 51