This is an article from our monthly newsletter. Sign up to the mailing list.
The value of the Prophet ﷺ is so high in Allah's eyes that the Almighty considers obedience to the Prophet ﷺ to be obedience to Himself. Allah has declared the necessity of observing the remembrance of the Prophet ﷺ in our hearts and on our tongues.
In each salat, we are commanded to recite in the tashahud:
السلام عليك أيها النبي ورحمة الله وبركاته
Peace be upon you O Prophet, as well as the mercy and blessings of Allah.
Although greetings someone during the prayer normally annuals it, Allah has not only exempted the salutation of His Prophet ﷺ from this, He has made it obligatory.
Imam Al Ghazali says in the Ihya Ulum Al Din:
"As you send your greetings to the Prophet ﷺ during salat, consider him present in person, in your heart. rest assured that your greetings will reach him and he will respond to you in an even better way."
Sources: Prophet Muhammad Mustafa the Elect, Osman Nuri Topbaş