What is an example of a situatiion where the Prophet Muhammad (saw) used to tell the Mu'adh-dhin to pronounce Adhan and say "Pray at your homes" at the end of the Adhan?
 Narrated Nafi`:                     Once in a cold night, Ibn `Umar pronounced the Adhan for the prayer at Dajnan (the name of a mountain) and then said, "Pray at your homes", and informed us that Allah's Apostle used to tell the Mu'adh-dhin to pronounce Adhan and say, "Pray at your homes" at the end of the Adhan on a rainy or a very cold night during the journey."