Sahih Muslim Book - 6, Hadith - 1604

وَحَدَّثَنِى عَلِىُّ بْنُ حُجْرٍ السَّعْدِىُّ حَدَّثَنَا إِسْمَاعِيلُ عَنْ عَبْدِ الْحَمِيدِ صَاحِبِ الزِّيَادِىِّ عَنْ عَبْدِ اللَّهِ بْنِ الْحَارِثِ عَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ أَنَّهُ قَالَ لِمُؤَذِّنِهِ فِى يَوْمٍ مَطِيرٍ إِذَا قُلْتَ أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ أَشْهَدُ أَنَّ مُحَمَّدًا رَسُولُ اللَّهِ فَلاَ تَقُلْ حَىَّ عَلَى الصَّلاَةِ قُلْ صَلُّوا فِى بُيُوتِكُمْ - قَالَ - فَكَأَنَّ النَّاسَ اسْتَنْكَرُوا ذَاكَ فَقَالَ أَتَعْجَبُونَ مِنْ ذَا قَدْ فَعَلَ ذَا مَنْ هُوَ خَيْرٌ مِنِّى إِنَّ الْجُمُعَةَ عَزْمَةٌ وَإِنِّى كَرِهْتُ أَنْ أُحْرِجَكُمْ فَتَمْشُوا فِى الطِّينِ وَالدَّحْضِ.

It was narrated that 'Abdullah bin 'Abbas said to his Mu'adhdhin on a rainy day: "When you say: 'I bear witness that there is none worthy of worship but Allah and I bear witness that Muhammad is the Messenger of Allah,' do not say, 'Come to prayer,' rather say: 'Pray in your dwellings."' It was as if the people found that strange, so he said: "Are you surprised by that? One who is better than me did that (i.e., The Prophet (s.a.w)). Jumu'ah is obligatory, but I did not want to force you to walk in the mud and on slippery ground."