"إذا سمعتم النداء، فقولوا كما يقول المؤذن"
Abu Sa'id Al-Khudri (May Allah be pleased with him) reported: The Messenger of Allah (ﷺ) said, "When you hear the Mu'adhdhin (pronouncing the call to Salat), repeat after him what he says." [Al-Bukhari and Muslim] .