"Two men recited a Tashahhud before the Prophet and one of them said: 'Whoever obeys Allah and His Messenger has been guided aright and whoever disobeys them has gone astray.' The Messenger of Allah said: 'What a bad speaker you are!'" (Using translation from Nasāʾī 3279)  

تَشَهَّدَ رَجُلَانِ عِنْدَ النَّبِيِّ ﷺ فَقَالَ أَحَدُهُمَا مَنْ يُطِعِ اللهَ وَرَسُولَهُ فَقَدْ رَشَدَ وَمَنْ يَعْصِهِمَا فَقَدْ غَوَى فَقَالَ رَسُولُ اللهِ ﷺ «بِئْسَ الْخَطِيبُ أَنْتَ»