Sunan Ibn Majah Book 5, Hadith 136
“Perform your prayer at your camps.”
“On rainy nights or on cold windy nights, the Messenger of Allah (ﷺ) would summon his announcer to call out: ‘Perform your prayer at your camps.’”
“Allahu Akbar, Allahu Akbar, Ashhadu an la ilaha illallah, Ashhadu anna Muhammadan Rasulullah (Allah is the Most Great, Allah is Most Great, I bear witness that none has the right to be worshipped but Allah, I bear witness that Muhammad is the Messenger of Allah).” Then he (Ibn ‘Abbas) said: “Proclaim to the people that they should pray in their houses.” The people said to him: “What is this that you have done?” He said: “One who is better than me did that. Are you telling me that I should bring the people out of their houses and make them come to me wading through the mud up to their knees?”