Musannaf Ibn Abi Shayba 3:3886

Hushaym narrated to us, from Khalid, from Abu al-Malih, from his father, who said: I was with the Prophet, may Allah bless him and grant him peace, in the year of al-Hudaybiyyah or Hunayn, and rain fell upon us that did not wet the soles of our sandals. Then the caller of the Messenger of Allah, may Allah bless him and grant him peace, called out: "Pray in your dwellings."