Is there an authentic, explicit Hadith stating that Jesus (peace be upon him) is alive, receiving sustenance in heaven, and will descend at the end of time to kill the Antichrist, or are the verses explicit about his death? And can it be said that Allah caused him to die and raised him to heaven, then will resurrect him at the time of his descent?

Christ Jesus, peace be upon him, is alive in heaven now, by consensus, and he will descend at the end of time. Regarding the verses about his death, the majority hold that it was a death of sleep, not actual death. Interpreters differed on its meaning, and Sheikh Al-Shinqiti mentioned three interpretations for it. The first interpretation: that the Almighty's saying, "I will take you in full" does not indicate a specific time nor that it has already passed, and the 'waaw' (and) in "and raise you" does not imply sequence. The second interpretation: that "I will take you in full" means "I will cause you to die in sleep," and the word 'wafah' (death/taking in full) may be used for sleep in the Quran. The third interpretation: that "I will take you in full" means "I will seize you alive unto Me," and this is what Ibn Jarir preferred. Therefore, it is incorrect to say that Allah will resurrect Jesus, peace be upon him, to descend to Earth, because he is alive now.