'Know' in the Bible

For behold, I will wave My hand over them so that they will be plunder for their slaves. Then you will know that the Lord of hosts has sent Me.

“Many nations will join themselves to the Lord in that day and will become My people. Then I will dwell in your midst, and you will know that the Lord of hosts has sent Me to you.

So the angel who was speaking 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 laid the foundation of this house, and his hands will finish it. Then you will know that the Lord of hosts has sent me to you.

So he answered me, saying, “Do you not know what these are?” And I said, “No, my lord.”

Those who are far off will come and build the temple of the Lord.” Then you will know that the Lord of hosts has sent me to you. And it will take place if you completely obey the Lord your God.