Asalamu 3alykum brother Mohammed
I hope you don't mind but I would just like to give my thoughts regarding your last message to brother Joseph.
You said
Suppose the practice of Janazah prayer is not in the general Muslim practice, then we will interpret the term Swalah in the verse 5:106 as the forthcoming mandatory prayer.
When someone dies, a community is responsible to setup a system or some sort of process to deal with the deceased. There seems to be a time frame when people should start to deal with burials, financial issues and unsolved matters of the deceased.
I think the main focus of the verse 5:106 is that there is a prayer that marks the start of collecting information and a start to move on.
Its arguable that the start would only be after some sort of prayer for the deceased and not the forthcoming mandatory prayer.
If one dies minutes before fajr and the witnesses already had taken the testimony , would be it plausible that right after fajr prayer they should be detained? Who are they going to be detained by if they are travelling in the land?
This strongly seems to illustrate that the body has been gathered and put in a place(possibly a mosque) and some sort of prayer was taking place by a community and that some people are authorized to collect the witnesses and take their testimonies.
I am still in doubt that whether this is a true practice in Islam or not. When Qur'an gives clear description for different acts of worships like Swalah, Hajj, Umrah, Fasting in Ramadan etc, regarding the Janazah prayer there is no sufficient proof from the Qur'an. Not even the term 'Janazah prayer' is used.
With all due respect brother, Joseph did not say that the Quran commands such a prayer or practice, but only that a possible voluntary practice from the believing community was taking place in the time the Quran was being revealed and the Quran seems to honour it or at least mention it and also commanded what to do after such a prayer. Yes it could of turned into a tradition of the believing people.
In my humble opinion there would be no need to change or criticize a practice that the Quran does not condemn yet arguably accepts.
After all the prayer of today in the main is not fully described in fine detail in the Quran but does indeed overlap what the Quran did command with regards how prayer should be observed. For example, the motions of the hands, the turning of the heads to the sides, etc
And if this form without prostration is a true practice in Islam, then from where humans got the form of this special prayer ? since Al Qur'an does not describe such a prayer anywhere in it. I believe it is just an assumption like, the many other assumed practices in the name of Islam.
I think the previous answer should explain this. Allah(swt) did not command that there should be a prayer for the deceased, and it is not part of the obligatory prayers so it is possibly up to people how they wish to perform the prayer for the dead and does not need to be with the same method. I would also add that there does seem to be some logic to the traditional kanazawa prayer as it shows that it should not be mistaken for the obligatory prayers. God knows best
Have you ever considered if the Quran mentions anything about how to bury the dead? I would like to share a article below as I think you will realize just because the Quran does not specifically fine detail a practice and how it should be done then if implemented it is forbidden or not part of true Islam.
It seems to not be the intention of the Quran to keep away communities from developing modest practices regarding certain aspects of life but to make sure they do not go against the main message.
Please see this article incase you have not read it.
Salam
PREPARING THE DEAD BODY FOR BURIAL AND THE QURAN'S PERSPECTIVE
http://quransmessage.com/articles/preparing%20the%20dead%20body%20for%20burial%20and%20the%20quran's%20perspective%20FM3.htm