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." (IT)
Reference (IT): Sunan an-Nasa'i 1438 (IT)
In-book reference (IT): Book 15, Hadith 6 (IT)
English translation (IT): Vol. 2, Book 15, Hadith 1439 (IT)