Everything Christ spoke can be backed by the prophets.
Zechariah 14:4 states that "his feet shall stand on the Mount of Olives" and that the mountain will split in two, from east to west, creating a large valley. This event is described as occurring "on that day" and is often interpreted in Christian theology as a reference to Christ's second coming.
Isaiah 65:17-25
17 “See, I will create
new heavens and a new earth The former things will not be remembered,
nor will they come to mind.
18 But be glad and rejoice forever
in what I will create,
for I will create Jerusalem to be a delight
and its people a joy.
19 I will rejoice over Jerusalem
and take delight in my people;
the sound of weeping and of crying
will be heard in it no more.
20 “Never again will there be in it
an infant who lives but a few days,
or an old man who does not live out his years;
the one who dies at a hundred
will be thought a mere child;
the one who fails to reach[
a] a hundred
will be considered accursed.
21 They will build houses and dwell in them;
they will plant vineyards and eat their fruit.
22 No longer will they build houses and others live in them,
or plant and others eat.
For as the days of a tree,
so will be the days of my people;
my chosen ones will long enjoy
the work of their hands.
23 They will not labor in vain,
nor will they bear children doomed to misfortune;
for they will be a people blessed by the Lord,
they and their descendants with them.
24 Before they call I will answer;
while they are still speaking I will hear.
25 The wolf and the lamb will feed together,
and the lion will eat straw like the ox,
and dust will be the serpent’s food.
They will neither harm nor destroy
on all my holy mountain,”
says the Lord.
Paul can't be backed. He had secret knowledge through a private vision.
Paul also claimed that the rapture would happen in his lifetime.
Christ believed in new Jerusalem descending on earth. We would then be given new bodies and we would have a restored eden.