Thank you brother Hamza and Brother Good logic for your replies.
Brother Hamza, I have some comments about your post.
From the verses you shared, I did not see any explicit indication that the children of Israel were obliged to follow scriptures other than the Torah. Maybe they did it out of choice, but I can't find where are they were commanded in the Quran to do so. So could you please elaborate on the issue ?
Also I read brother Joseph's view regarding the Injeel. But he only used implicit arguments. And I found that other verses could be used to suggest the the injeel was indeed a book. Such as:
[19:30]
[Jesus] said, "Indeed, I am the servant of Allah. He has given me the Scripture and made me a prophet.
ِArguably the scripture or (Ketab in Arabic) here is the injeel.
ِAlso from what I understood, If we say that Injeel is only the wisdom imparted to prophet jesus, would that mean that its not the direct word of God. And only Jesus' own words. If that is the case, then I believe it would be a problematic assertion that would not be in harmony with verses like:
[3:3]
He has sent down upon you, [O Muhammad], the Book in truth, confirming what was before it. And He revealed the Torah and the Gospel.
The word Revealed or (Anzal in Arabic) is used for both the Torah and Injeel. It is also used with the Quran. I believe that would imply the same mode of inspiration. Which would arguably be God's direct word (like the Torah and Quran). Not Prophet Jesus' wisdom.
I do not intend to enter a debate, I would just like to know what are your thoughts.
Thanks again for your reply