'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? for these seven shall rejoice, and shall see the plummet in the hand of Zerubbabel; these are the eyes of Jehovah, which run to and fro through the whole earth.

And the strong went forth, and sought to go that they might walk to and fro through the earth: and he said, Get you hence, walk to and fro through the earth. So they walked to and fro through the earth.