Hadith 619
´It was narrated from Thawban that:` The Messenger of Allah said: "No one among the Muslims should stand to pray when he is suppressing (the need to urinate or defecate), until he has to relieve himself."
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.’”