بسم اللہ الرحمٰن الرحیم
The Quran is the highest authority, it is the absolute truth and it is Al Furqan, and sits in judgement of the Ahadith.
To keep this reply relatively short I'll only briefly address the mention of Hz Isa (Jesus, son of Mary) in the Quran.
Any Muslim will know the story of Hz Isa (a.s). He was sent to the Israelites. As was their defiantly disobedient nature they rejected him as the prophet and as the Messiah and tried to crucify him.
But they could not, as Allah says in the Quran.
And [for] their saying, "Indeed, we have killed the Messiah, Jesus, the son of Mary, the messenger of Allah ." And they did not kill him, nor did they crucify him; but it was made to appear to them. And indeed, those who differ over it are in doubt about it. They have no knowledge of it except the following of assumption. And they did not kill him, for certain.
Rather, Allah raised him to Himself. And ever is Allah Exalted in Might and Wise.(An Nisa 4:157-158)
Now it is clear that Jesus was not killed rather raised unto Allah. But Quran also tells us that every soul must taste death, hence Jesus WILL return to live the rest of his life.
Now what is the condition today? The Jews have rejected Jesus and the Christians have taken him as a God. But Allah goes further on to say,
And there is none from the People of the Scripture but that he will surely believe in Jesus before his death. And on the Day of Resurrection he will be against them a witness.( An Nisa 4:159)
These are the clear verses of Quran that make it evident that Jesus, son of Mary, will return to this Earth as the Messiah, he will complete his remaining life and he will make clear the Truth for the Jews and the Christians. And then will his death approach.
سبحان الله
How beautiful and comprehensive is the Quran. Sadly this Ummah has abandoned and betrayed the Quran. Then there are those who have never picked up the Quran yet they have the courage to speak as they are the absolute authority on the subject.