This can have two meanings:
(1) "That these angels perform the service of communicating messages between Allah and His Prophets :" and
(2) "that it is the duty of these angels to convey and enforce the Commands of Allah Almighty throughout the universe."
The object is to impress this truth: The position of the angels whom the polytheists have made their gods and goddesses is no more than of obedient servants of Allah, the One. Just as the servants of a king run about for the implementation of his orders, so do these angels fly about in the service of the real Sovereign of the Universe. These servants have no authority of their own; All powers rest with Allah, Who is the real Sovereign.
We have no means to know what is the nature of the wings of these angels. But when Allah has used this word, which in human language is used for the wings of birds, instead of any other words, to express and depict the truth, one can certainly conclude that this very word of our language is nearest to the actual meaning. The mention of two and three and four pairs of the wings shows that different angels have been granted different degrees of powers by Allah. They have been equipped with different powers of speed and efficiency as demanded by the nature of service for which they arc employed.
These words show that the number of the wings of the angels is restricted to four, but Allah has provided some angels with more wings than four. According to a Hadith related by Hadrat 'Abdullah bin Mas'ud, the Holy Prophet once saw the Angel Gabriel (peace be upon hits) with six hundred wings. (Bukhari, Muslim, Tirmidhi). Hadrat 'A'ishah relates that the Holy Prophet had seen Gabriel twice in his real shape: he had six hundred wings and had covered the whole horizon. (Tirmidhi)
This also is meant to remove the misunderstanding of the polytheists, who believed that from among the servants of Allah some one gave them the jobs, some one the children and some one health to their patients. All these superstitions of shirk are baseless, and the pure truth is just that whatever of mercy reaches the people, reaches them only through Allah Almighty's bounty and grace. No one else has the power either to bestow it or to withhold it. This theme has been expressed at many places in the Qur'an and the Ahadith in different ways so that man may avoid the humiliation of begging at every door and at every shrine and may realize that making or marring of his destiny.n the power of One Allah alone and of none else.
He is the All-Mighty": He is dominant and the owner of Sovereignty: none can stop His judgments from being enforced. Also "He is All-Wise": every of His is based on wisdom. When He gives somebody something He because it is demanded by wisdom, and when He withholds something judgment gives it from somebody He withholds it because it would be against wisdom to give it.