ينـزل الملائكة بالروح من أمره على من يشاء من عباده أن أنذروا (16:2) بالانجليزي

(16:2) He sends down by His command through His angels the Spirit *3 on that one of His servants whom He chooses, *4 (bidding), "warn the people that there is no other deity than I therefore, fear Me. " *5

Tafseer Abu-al-A'la Maududi

Page 267 English Traditional

*3) This means "the Spirit of Prophethood with which a Prophet is imbued in order to fulfil his Mission by word and decd. The Qur'an has called this the Spirit' in several places, for this has the same relation to the Mission of a Prophet and his moral life, which the soul has to the physical human life. "
*4) As one of the things, which prompted the disbelievers to challenge the Holy Prophet for scourge, was their presumption that he was not a true Prophet, Allah told them categorically that he was a true Prophet, who had been imbued with the "Spirit" which We Ourself had sent down on him.
"Allah sends down the Spirit on..... He chooses." This is the answer to the objections which the chiefs of the Quraish used to raise against the Holy Prophet: Had AIlah wanted to send a Messenger to them, was there no one better than Muhammad (Allah's peace be on him), son of `Abdullah, for this mission ? Why did He not choose one of the big chiefs of Makkah or Taif for the purpose? Such absurd objections needed no other answer than this that is why such an answer has been given in several places of the Qur'an as if to say "Allah knows best how to do His work, and dces not stand in need of any advice from you. He chooses for His mission anyone whom He considers fit for it.
*5) This verse declares the essence of the "Spirit" of Prophethood, which is this: Godhead belongs to one Allah alone: so only He is worthy of fear. Therefore, there is no other anchor that might make fast and hold together human moral system than His fear. For it is the fear of His displeasure and His punishment, and the fear of the consequences of His disobedience which alone can act as a strong deterrent to restrain one from deviation. That is why mankind has been admonished: "Fear Me. "