Imam Ali (as) on Prophet Muhammad (SAW):

 دَفَنَ [اللهُ ] بِهِ الضَّغَائِنَ، وَأَطْفَأَ بِهِ الثَّوَائِر، وأَلَّفَ بِهِ إِخْوَاناً، وَفَرَّقَ بِهِ أَقْرَاناً، أَعَزَّ بِهِ الذِّلَّةَ، وَأَذَلَّ بِهِ الْعِزَّةَ، كَلاَمُهُ بَيَانٌ، وَصَمْتُهُ لِسَانٌ.

Through him, Allah buried mutual rancour and put off the flames of revolt. Through him, He gave them affection like brothers and separated those who were together. Through him, He gave honour to the low and degraded honour. His speaking is clear and his silence is (indicative) like a tongue.

Sermon 96 of Nahjul Balagha

بِسمِ اللَّهِ الرَّحمٰنِ الرَّحيمِ
۲ إِنّا أَعطَيناكَ الكَوثَرَ ۱ فَصَلِّ لِرَبِّكَ وَانحَر
۳ إِنَّ شانِئَكَ هُوَ الأَبتَرُ

In the Name of Allah, the All-beneficent, the All-merciful.
Indeed We have given you abundance.1 So pray to your Lord, and sacrifice 2 
Indeed it is your enemy who is without posterity. 3

Noble Quran: Surah al-Kawthar