'Happen' in the Bible

And Peter took him aside [and] began to rebuke him, saying, {God forbid}, Lord! This will never happen to you!"

And Jesus answered [and] said to them, "Truly I say to you, if you have faith and do not doubt, you will do not only [what was done to] the fig tree, but even if you say to this mountain, 'Be lifted up and thrown into the sea," it will happen!

And [as] he was sitting on the Mount of Olives, the disciples came up to him privately, saying, "Tell us, when will these [things] happen, and what [will be] the sign of your coming and of the end of the age?"

And you are going to hear about wars and rumors of wars. See to it that you are not alarmed, for this must happen, but the end is not yet.

But pray that your flight may not happen in winter or on a Sabbath.

For at that time there will be great tribulation, such as has not happened from the beginning of the world until now, nor ever will happen.

How then would the scriptures be fulfilled that it must happen in this way?"