If the Imam prolongs the Salat (prayer) and somebody has an urgent work or need and so he leaves the congregation and offers Salat alone.
باب إِذَا طَوَّلَ الإِمَامُ وَكَانَ لِلرَّجُلِ حَاجَةٌ فَخَرَجَ فَصَلَّى
225
Sahih Bukhari
Sahih
حَدَّثَنَا آدَمُ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنِ الأَعْمَشِ، عَنْ أَبِي وَائِلٍ، عَنْ حُذَيْفَةَ، قَالَ أَتَى النَّبِيُّ صلى الله عليه وسلم سُبَاطَةَ قَوْمٍ فَبَالَ قَائِمًا، ثُمَّ دَعَا بِمَاءٍ، فَجِئْتُهُ بِمَاءٍ فَتَوَضَّأَ.
Narrated Hudhaifa:
Once the Prophet (ﷺ) went to the dumps of some people and passed urine while standing. He then asked for water and so I brought it to him and he performed ablution.
Reference: Sahih al-Bukhari 224 In-book : Book 4, Hadith 91 USC-MSA web (English) : Vol. 1, Book 4, Hadith 224 (deprecated)
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