بُلُوغُ الْمَرَامِ
Bulugh al-Maram 249
The Book of Prayer
وَلَهُ : عَنْ عَائِشَةَ -رَضِيَ اَللَّهُ عَنْهَا- قَالَتْ : سَمِعْتُ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -يَقُولُ : { لَا صَلَاةَ بِحَضْرَةِ طَعَامٍ , وَلَا هُوَ يُدَافِعُهُ الْأَخْبَثَانِ } [1]
Narrated 'Aishah (RA) in another narration of it from Muslim: I heard Allah's Messenger (ﷺ) said: "No Salat (prayer) can be (rightly offered) with food brought (before the worshiper) or when he is resisting the urge to relive himself of the two filths (i.e. urine and feces)."
Sunnah.com reference: Book 2, Hadith 119