'Happen' in the Bible

Look, you have driven me out today from the face of the ground, and from your face I must hide. I will be a wanderer and a fugitive on the earth, and it will happen that whoever finds me will kill me."

and it shall happen [that], if the Egyptians see you, then they will say, 'This [is] his wife,' then they will kill me but let you live.

it shall happen [that] when he sees that the boy is gone, he will die. And your servants will bring down the gray head of your servant, our father, to Sheol with sorrow.

And it shall happen [that] at the harvest, you must give a fifth to Pharaoh and four-fifths shall be yours, as seed for the field and for your food and for those who [are] in your households, and as food for your little ones."

Then Jacob called his sons and said, "Gather together so that I can tell you what will happen with you in {days to come}.