It was narrated that Anas said:
"I went out with the Messenger of Allah (ﷺ) from Al-Madinah to Mekkah, and he continued to shorten his prayers, and he stayed there for ten days." (ES)
Reference (ES): Sunan an-Nasa'i 1438 (ES)
In-book reference (ES): Book 15, Hadith 6 (ES)
English translation (ES): Vol. 2, Book 15, Hadith 1439 (ES)