Musnad Ahmad 27:1350

Muhammad ibn Ubayd narrated to us, Ubayd Allah narrated to us, from Nafi’, that Ibn Umar called for prayer on a night of cold and wind. Then he said at the end of his call: "Lo, pray in your dwellings, lo, pray in your dwellings, lo, pray in the dwellings." For the Messenger of Allah, peace and blessings of Allah be upon him, used to command the caller to prayer, when it was a cold night, or a night of rain, or a night of wind while traveling: "Lo, pray in the dwellings."