'Fro' in the Bible

And the man that stood among the myrtle-trees answered and said, These are they whom Jehovah hath sent to walk to and fro through the earth.

And they answered the angel of Jehovah that stood among the myrtle-trees, and said, We have walked to and fro through the earth, and behold, all the earth sitteth still and is at rest.

For who hath despised the day of small things? Yea, they shall rejoice even those seven and shall see the plummet in the hand of Zerubbabel: these are the eyes of Jehovah, which run to and fro in the whole earth.

and the strong go forth, and seek to go that they may walk to and fro through the earth. And he said, Go, walk to and fro through the earth. And they walked to and fro through the earth.