Muwatta Malik #384
Shortening the Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، قَالَ لاَ يُصَلِّيَنَّ أَحَدُكُمْ وَهُوَ ضَامٌّ بَيْنَ وَرِكَيْهِ .
Yahya related to me from Malik from Zayd ibn Aslam that Umar ibn
al-Khattab said, "You should not pray while you are holding your
bowels."
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This hadith is #384 from Muwatta Malik, in the Book of Shortening the Prayer.