Asalamu Alykum brother Mohammed
You said
And when we look through the Verses 100 to 103 from the Surah ‘Nisa'’(No.4) we can understand that the Verses 100 & 101 are an order/command to the Believers but not for the Prophet (since it mentions about the Believers who gets out from their homes emigrating to Allah and His Messenger), and the next Verse starting with the term ‘Wa idhaa kuntha feehim...’which is exclusively for the Prophet, which may indicates that the shortening of the Prayer is applicable only for Believers and not for the Prophet. So, what the Prophet performed at that place may be the real form/structure of the Prayer and not a shortened form of the Prayer.
Verse 4:101 is basically stating to anyone in fear from amongst the believers whether in a group or alone may shorten there regular prayers that they establish. I do not find any reason to limit this only for the believers and not the prophet. This may also apply that even when the prophet is among groups of believers and there is fear of attach from the disbelievers, the prophet and all those with him may shorten the prayer. Verse 4:102 also maybe a shorten practice of the regular prayer they usually established. God knows best
Verse 4:102 is stating that when prophet Muhammad(pbuh) is amongst the believers that they should not all be praying at once. But possibly because he was the leader there is an expectation from God that the prophet leads the prayers.
The main message is that even if in a safe place in a time of war, that believers should not all pray at once but always have a party on defence. However in verse 4:102 the prophet would be the leader of prayer so is expected to pray as an imam for the parties that are with him.
Thus from the Verse 102, we can interpret that, the Swalah contains two units, each unit involves Standing and Prostrating.
"faitha sajadoo" (and when they have performed their prostrations,) does not indicate how many units has been done. You have assumed it is once.
In Qur’an the verses 3:113 & 50:40 mention what to say/do during standing and prostrating, some other verses (like 32:15) also indicates the glorification in prostration,
Those verses you mentioned do not detail exactly what to say. For example verse 3:113 says that there seems to be a group from the People of the Book that recite the revelations of Allah(swt) in the nights, and they prostrate before the Lord. It is also possible this group is reciting the previous Scriptures of God.
The question still remains, which chapters or verses should be recited? What duration of time etc?
I think you have to admit that God has allowed believers to establish a practice of prayer and not spoon feed them every detail. Of course that the format must include what God had made obligatory but also those obligatory actions are not meant to go into every step. Even a call for prayer has been accepted from the Quran 62:9. But what to say is not mentioned.
I think the verses 17:110 & 111 help us to understand what to say and how to say in Swalah better. And nowhere it is mentioned raising the hands and/ or placing it on stomach or saying Allahu Akbar (which is not Quranic), instead Allah tells us to call Him Allah or Al Rahman (17:110).
The Quran also does not state that one should place his hands on his side or in front. I think you are expecting that every detail should be mentioned and if it is not then it is un-Quranic.
Also 17:110 states that " Call unto Allah, or call unto the Beneficent/Merciful, unto whichsoever you call(it is the same).
His are the most beautiful names(falahu alasmaaoo alhusna)Any names that represent the greatest attributes whether mention in the Quran or not maybe used to relate or to call to the Lord.
I kindly share a excerpt of a post with you:
"Once again, how has a simple command, to 'Establish prayer' with a few guiding principles confounded so many? God arguably provides ritual flexibility in His Divine wisdom, man attempts to shackle himself with unnecessary burdens.
This is arguably a DISEASE inherent in humans.
002:067
"And when Moses said to his people: Indeed God commands you that you should sacrifice a cow. They said: Do you ridicule us? He said: I seek the protection of God from being one of the ignorant
002:068
"They said: Pray to your Lord for us to make it clear to us what she is. Moses said: He says, Indeed she is a cow neither advanced in age nor too young, of middle age between that (and this); so do what you are commanded"
002:069
"They said: Pray to your Lord for us to make it clear to us what her colour is. Moses said: He says, Surely she is a yellow cow; bright in her colour, giving delight to the beholders"
002:070
"They said: Pray to your Lord for us to make it clear to us what she is. for indeed to us the cows are all alike, and if God pleases we shall surely be guided aright"
002:071
"He (Moses) said: He (God) says, Indeed she is a cow not trained to plough the earth, nor does she water the field; sound, without a blemish in her. They said: Now you have brought the truth; so they sacrificed her, though they had not the mind to do (it)"Nothing remains more striking than the desire of the human condition to elicit finer and finer details of a general religious commandment to the point that it becomes almost arduous for them to perform."
From verses 2:67-71 if Mose's people had sacrificed
any cow from when the command was first initiated in verse 2:67 would God had accepted it?
Salam bro
A SIMPLE INSTRUCTION CONFOUNDS MANY - 'ESTABLISH SALAAT'
https://www.facebook.com/joseph.a.islam/posts/487157614754704