"Messenger of Allah said to Bilal: "O Bilal! When you call the Adhan then do so deliberately and slowly, and when you call the Iqamah then be quick. Allow enough time between your Adhan and Iqamah for the person eating to finish what he is eating, the person drinking to finish what he is drinking, and the one who needs time to relive himself, and do not stand until you see me."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لِبِلاَلٍ يَا بِلاَلُ إِذَا أَذَّنْتَ فَتَرَسَّلْ فِي أَذَانِكَ وَإِذَا أَقَمْتَ فَاحْدُرْ وَاجْعَلْ بَيْنَ أَذَانِكَ وَإِقَامَتِكَ قَدْرَ مَا يَفْرُغُ الآكِلُ مِنْ أَكْلِهِ وَالشَّارِبُ مِنْ شُرْبِهِ وَالْمُعْتَصِرُ إِذَا دَخَلَ لِقَضَاءِ حَاجَتِهِ وَلاَ تَقُومُوا حَتَّى تَرَوْنِي  

(Another chain for) a similar narration (as no. 195).