Sunan an Nasai
408
Sahih+2

It was narrated that Maimunah said:"I put some water out for the Messenger of Allah (ﷺ), then I concealed him" - and she mentioned how he performed Ghusl, then she said: "Then I brought him a cloth (a towel) but he did not want it

SahihAbu Ghuddah
SahihAl-Albani