If it is pronounced nabīʾ (prophet), with a hamzah, it is on the pattern faʿīl, derived from nabaʾ (news). Here faʿīl carries both an active and a passive sense, for he is one who conveys news and one who is informed.
But if it is pronounced nabiyy (prophet), with a doubled ya and without a hamzah, then either its original form contained a hamzah, which was omitted for ease of pronunciation, or it is derived from nabwah (elevation), meaning loftiness. He was called this because of the loftiness of his rank, peace and blessings be upon him.
If it is asked: Could we not say that nabiyy, with a ya, derives from both meanings: from nabwah, meaning elevation, and from nabaʾ, meaning news?
The answer is: Yes, that is possible, because the principle is that when a word admits of two meanings that are not mutually contradictory, and there is no reason to prefer one over the other, it is understood as encompassing them both. There is no doubt that the Messenger’s rank, peace and blessings be upon him, is the loftiest of ranks, and that he both receives and conveys news.
“And Allah’s mercy and His blessings.”
His words, “and Allah’s mercy”: “mercy” is coordinated with “peace be upon you,” meaning, “and Allah’s mercy be upon you.” Thus, it may be understood as the coordination of one clause with another, with the predicate omitted. It may also be understood as the coordination of one noun with another, in which case there is no need to supply an omitted predicate.
When mercy is coupled with forgiveness or peace, it has one meaning; when it is mentioned on its own, it has another. When coupled with forgiveness or peace, it refers to that by which what is sought is attained, whereas forgiveness and peace refer to that by which what is feared is removed. When mentioned on its own, it encompasses both matters. Thus, after supplicating for the Messenger, peace and blessings be upon him, to be granted peace, you supplicate for him to be granted mercy: so that what is feared may be removed from him and what is sought may be attained for him.
If someone asks: Why did he begin with peace before mercy?
The answer is that removal comes before adornment.