'Know' in the Bible

For, behold, I will shake my hand over them, and they will be a spoil to those who served them; and you will know that Yahweh of Armies has sent me.

Many nations shall join themselves to Yahweh in that day, and shall be my people; and I will dwell in the midst of you, and you shall know that Yahweh of Armies has sent me to you.

Then the angel who talked with me answered me, "Don't you know what these are?" I said, "No, my lord."

"The hands of Zerubbabel have laid the foundation of this house. His hands shall also finish it; and you will know that Yahweh of Armies has sent me to you.

He answered me, "Don't you know what these are?" I said, "No, my lord."

Those who are far off shall come and build in the temple of Yahweh; and you shall know that Yahweh of Armies has sent me to you. This will happen, if you will diligently obey the voice of Yahweh your God."'"