Allaah (The Most High) said:
“النَّبِيُّ أَوْلَىٰ بِالْمُؤْمِنِينَ مِنْ أَنفُسِهِمْ
The Prophet is more worthy of the believers than themselves. [Al-Ahzaab. Ayah:6]
The closest thing a person possesses and the most important thing he has is him (or herself). However, the Messenger (sallal-laahu-alayhi-wasallam) is more worthy of person than him (or herself). That is because the Messenger (sallal-laahu-alayhi-wasallam) gave them (i.e. the creation) sincere advise, and showed them affection and compassion. There is none who shows the most mercy and compassion to the creation except that the Messenger is the greatest favour amongst the creation to the people than everyone else. That is because neither an atom’s weight of good has reached them nor an atom’s weight of evil is repelled from them, except through him (i.e. due to the message he conveyed to them from Allaah). And for this reason it is obligated on them that when the desires of their souls are in opposition to what the Messenger wants (from them), they should give precedence to what the Messenger wants (from them). They should not oppose the statement of the Messenger (sallal-laahu-alayhi-wasallam) with the statement of anyone else-regardless who that person may be-and they are to sacrifice themselves, their wealth and offspring in giving precedence to loving the Messenger (sallal-laahu-alayhi-wsallam) over the entire creation. They are not to say anything (i.e. in the religion) until he says so, nor do they put themselves forward before him.
[Abridged and Paraphrased from ‘Tayseer Al-Kareem Ar-Rahmaan Fee Tafseer Kalaam al-Mannaan’ of Imaam Sadi (rahimahullaah). Pulisher: Daar Ibn Hazm’ 1st ed. 1424AH (Year 2003)]