Hadith 617
´It was narrated from Abu Umamah that:` The Messenger of Allah forbade a man to perform prayer when he was suppressing (the urge to urinate or defecate).
Hadith 923
´It was narrated that Thawban said:` “The Messenger of Allah (ﷺ) said: ‘No person should lead others in prayer, then supplicate only for himself and not for them. If he does that, he has betrayed them.’”