'Happens' in the Bible

but has no root in himself, but is for a time only; and when tribulation or persecution happens on account of the word, he is immediately offended.

And if he happens to find it, truly I say to you that he rejoices over it more than over the ninety-nine that did not wander away.

"How terrible it will be for you, scribes and Pharisees, you hypocrites! You travel over land and sea to make a single convert, and when this happens you make him twice as fit for hell as you are.