It was narrated from Anas that the Prophet (ﷺ took the hem of his garment and spat on it, rubbed it together briefly and let it drop)
Hadith No. 308
Sunan an Nasai
Gradings:
Abu Ghuddah:
Sahih
Al-Albani:
Sahih
Zubair Ali Zai:
Sahih Bukhari