“The word Salah has three meanings, in the language linguistically As-Salah means dua, that you make dua. Your whole Salah is dua from Subhanakalla Humma (if you are a Hanafi) Wajjahadahu (if you are Shafai) and the whole Fatiha (Surah Fatiha) is dua.
In the language As-Salah is dua and therefore As-Salah comes from the word Silah (connection) also. Silah is connection, if you have Salah you have Silah. Very simple, Salah means Silah. You are doing Salah you have Silah with Allah, you have no Salah there is no Silah, your Silah with Allah is not there.
Hada Filluha like Filmustulah As-Salah has three meanings depending who we ascribe it to, if we say the human beings or the jinn make Salah it means they are making the dua or they are doing the Salah like we do. If we say the Malaika make Salah it means they are doing istigfar, Huwallazi Yu Salli Alaikum Wa Malaikatahu (He is the One who sends peace and blessings on you and His angels as well. Al Quran 33:43), Allah says is Malaika do salah on you. What does that that mean? It means they say Ya Allah forgive them and raise them that’s what it means.
if the Salah is attributed to Allah rabbul izzat, Innallaha Wa Malikatahu Yu Salun (Surely, Allah and his angels sends blessings and greetings on the holy Prophet. Al Quran 33:56) if its attributed to Allah, a Salah from Allah means to purify all and raise the rank and to pour the blessings and Rahamah and Baraqah so we say Innallaha Wa Malikatahu Yu Saluna Alan Nabi (Al Quran 33:56) when Allah is doing Salah on An Nabi (sallallahu alayhi wa aalihi wasallam) that means Allah subhanahu wa taala is continuously pouring the blessings and the Baraqah and the Rahamah and all these things on Saiyyiduna RasulAllah (sallalahu alayhi wa aalihi wasallam) and is continuously raising his rank continuously all the time from perfection to higher perfection and from higher perfection to higher perfection and from higher perfection to higher and higher perfection from Kamaal ila Hakman and from Fatalin ila Afzal continuously until the end of times.
Innallaha Wa Malaikatuhu… always, it doesn’t say Sallun until yaumal qiyamah (day of judgement), it doesn’t say Sallun until they go to Jannah (heaven) La (no), Sallun everlastingly and that tells you the maqam of Saiyyiduna RasulAllah (sallallahu alayhi wa aalihi wasallam) his continuous perfection from perfection to higher perfection till the end and end where there is no end that tells you the Maqam (lofty station) and Kamal (splendour) of Mustafa (sallallahu alayhi wa aalihi wasallam).”
– Sayyidi Shaykh Muhammad bin Yahya Al Ninowy Hafizahu’Allah