'Happens' in the Bible

"If a man has two wives, [and] the one [is] loved and the [other] one [is] disliked and the one loved and the one that is disliked have borne for him sons, if it happens [that] the firstborn son {belongs to the one that is disliked},

"If it happens [that] a young woman, a virgin, [is] engaged to a man, [and] a man finds her in the town and lies with her,

“If there is any man among you who is [ceremonially] unclean because of nocturnal emission, then he must go outside the camp; he shall not come back to the camp.

“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,

When that happens, my anger will burn against them, because they will have abandoned me. I'll hide my face from them, they will be consumed, and many evils and distresses will find them. When this happens, they will say, "These troubles have happened to us because God isn't among us.'