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