It wasnarrated that Thawban said:
"The Messenger of Allah (ﷺ)said: 'Noperson should lead others in prayer, then supplicate onlyfor himselfand not for them. If he does that, he has betrayed them.'" (ID)
English reference (ID): Vol. 1, Book 5, Hadith 923 (ID)
Arabic reference (ID): Book 5, Hadith 976 (ID)