The Messenger of Allah ﷺ said: Allah , the Exalted, hates the eloquent one among men who moves his tongue round (among his teeth), as cattle do.  

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ اللَّهَ ﷻ يُبْغِضُ الْبَلِيغَ مِنَ الرِّجَالِ الَّذِي يَتَخَلَّلُ بِلِسَانِهِ تَخَلُّلَ الْبَاقِرَةِ بِلِسَانِهَا  

The Prophet ﷺ said: On the Day of resurrection Allah will not accept repentance or ransom from him who learns excellence of speech to captivate thereby the hearts of men, or of people.  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ تَعَلَّمَ صَرْفَ الْكَلاَمِ لِيَسْبِيَ بِهِ قُلُوبَ الرِّجَالِ أَوِ النَّاسِ لَمْ يَقْبَلِ اللَّهُ مِنْهُ يَوْمَ الْقِيَامَةِ صَرْفًا وَلاَ عَدْلاً  

When two men who came from the east made a speech and the people were charmed with their eloquence, the Messenger of Allah (May peace be upon him) said: In some eloquent speech there is magic.  

أَنَّهُ قَالَ قَدِمَ رَجُلاَنِ مِنَ الْمَشْرِقِ فَخَطَبَا فَعَجِبَ النَّاسُ يَعْنِي لِبَيَانِهِمَا فَقَالَ رَسُولُ اللَّهِ ﷺ إِنَّ مِنَ الْبَيَانِ لَسِحْرًا أَوْ إِنَّ بَعْضَ الْبَيَانِ لَسِحْرٌ  

It would have been better for him. I heard the Messenger of Allah ﷺ say: I think (or, I have been commanded) that I should be brief in what I say, for brevity is better.  

عَمْرٌو لَوْ قَصَدَ فِي قَوْلِهِ لَكَانَ خَيْرًا لَهُ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ لَقَدْ رَأَيْتُ أَوْ أُمِرْتُ أَنْ أَتَجَوَّزَ فِي الْقَوْلِ فَإِنَّ الْجَوَازَ هُوَ خَيْرٌ