'Know' in the Bible

For, behold, I will shake my hand over them, and they shall be a spoil to those that served them; and ye shall know that Jehovah of hosts hath sent me.

And many nations shall join themselves to Jehovah in that day, and shall be my people; and I will dwell in the midst of thee, and thou shalt know that Jehovah of hosts has sent me unto thee.

The hands of Zerubbabel have laid the foundation of this house; his hands shall also finish it; and thou shalt know that Jehovah of hosts hath sent me unto you.

And they that are far off shall come and build in the temple of Jehovah; and ye shall know that Jehovah of hosts hath sent me unto you. And this'shall come to pass, if ye will diligently obey the voice of Jehovah your God.