'Know' in the Bible

"Yes, look! I [am] going to wave my hand against them, and they will become plunder for their servants, and you will know that Yahweh of hosts has sent me.

"Many nations will join themselves to Yahweh on that day, and they will be my people, and I will dwell in your midst. And you will know that Yahweh of hosts has sent me to you.

And the angel [who was] talking with me answered and said to me, "Do you not know what these [are]?" And I said, "No, my lord."

"The hands of Zerubbabel have founded this house, and his hands will finish it. And you will know that Yahweh of hosts has sent me to you.

And he replied to me, "Do you not know what these [are]?" And I said, "No, my lord."

And those who are far off will come and build the temple of Yahweh, and you will know that Yahweh of hosts has sent me to you. And it will happen if you will listen diligently to the voice of Yahweh your God."