By the esteemed Shaykh Muhammad ibn Saalih al-'Uthaymeen [1]

This right is the greatest right of any of the creation. None of the creation have a right greater than the rights of Allaah's Messenger sallallaahu 'alayhi wa sallam. Allaah - the Most High - said:

"Indeed We have sent you as a witness rind a bringer of good-tidings and a warner, in order that mankind may believe in Allaah and His Messenger, and that you may assist and honour the Messenger." [Soorah al-Fath 48:89]