(43) باب أَيُصَلِّي الرَّجُلُ وَهُوَ حَاقِنٌ
Narrated Thawban:
The Messenger of Allah (ﷺ) said: Three things one is not allowed to do: supplicating Allah specifically for himself and ignoring others while leading people in prayer; if he did so, he deceived them; looking inside a house before taking permission: if he did so, it is as if he entered the house, saying prayer while one is feeling the call of nature until one eases oneself.
Reference: Sunan Abi Dawud 90
In-book reference: Book 1, Hadith 90
English translation: Book 1, Hadith 90