John 14:29
"And now I have told you before it happens, so that when it does happen, you will believe."
Matthew 24:23-27
"And now I have told you before it happens, so that when it does happen, you will believe. For false Christs and false prophets will appear and perform great signs and wonders that would deceive even the elect, if that were possible. See, I have told you in advance.
So if they tell you, ‘There He is in the wilderness,’ do not go out; or, ‘Here He is in the inner rooms,’ do not believe it. For just as the lightning comes from the east and flashes as far as the west, so will be the coming of the Son of Man."
Out of the hundreds of prophecies in the Old Testament, most of them regard the first coming of Christ: His birth, His life, His death, His return. We know that most have come to pass. Because the Word of God Is Faithful and True, we can believe It. The Word does not contradict itself.
But as Jesus tells us in Matthew 24, the people who will be around to see those events happen need to be careful in what/who they listen to and guard their hearts.
