ENOfficial
She said: God's messenger did not go on talking rapidly as you do, but would talk in such a way that anyone who wished to count his words would be able to do so. (Bukhari and Muslim.)
Source: sunnah.com
Other translations
Arabic
وَعَنْهَا قَالَتْ: إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَمْ يَكُنْ يَسْرُدُ الْحَدِيثَ كَسَرْدِكُمْ كَانَ يُحَدِّثُ حَدِيثًا لَوْ عَدَّهُ الْعَادُّ لَأَحْصَاهُ. مُتَّفق عَلَيْهِ
sunnah.com