[Machine] He used to say that when the Muslims arrived in the city, he mentioned the saying in the beginning of the call to prayer and at its end. So the Messenger of Allah ﷺ said, "O Bilal, stand up and call for prayer."  

أَنَّهُ كَانَ يَقُولُ كَانَ الْمُسْلِمُونَ حِينَ قَدِمُوا الْمَدِينَةَ فَذَكَرَ الْحَدِيثَ فِي بَدْءِ الْأَذَانِ وَفِي آخِرِهِ فَقَالَ رَسُولُ اللهِ ﷺ يَا بِلَالُ قُمْ فَنَادِ بِالصَّلَاةِ  

[Machine] That a person should not call the Adhan except when he is in a state of purity, and he should not call the Adhan except when he is standing.  

أَنْ لَا يُؤَذِّنَ الرَّجُلُ إِلَّا وَهُوَ طَاهِرٌ وَلَا يُؤَذِّنُ إِلَّا وَهُوَ قَائِمٌ