Nafi' narrated that Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) gave the adhan for the Isha prayer on a cold night at a place called Dajnan, and after it he said: "Listen! Pray in your dwellings." And he told us that the Messenger of Allah (peace and blessings be upon him) used to order the mu'adhdhin to say these words after the adhan: "On a cold or rainy night during a journey, pray in your dwellings."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1867