'Happens' in the Bible

“When a man takes a wife and marries her, and it happens that she finds no favor in his eyes because he has found some indecency in her, and he writes her a certificate of divorce and puts it in her hand and sends her out from his house,

and if it happens that the king’s wrath rises and he says to you, ‘Why did you go so near to the city to fight? Did you not know that they would shoot from the wall?

Now Ahimaaz the son of Zadok said once more to Joab, “But whatever happens, please let me also run after the Cushite.” And Joab said, “Why would you run, my son, since you will have no reward for going?”

“But whatever happens,” he said, “I will run.” So he said to him, “Run.” Then Ahimaaz ran by way of the plain and passed up the Cushite.

There is futility which is done on the earth, that is, there are righteous men to whom it happens according to the deeds of the wicked. On the other hand, there are evil men to whom it happens according to the deeds of the righteous. I say that this too is futility.