'Lo' in the Bible

And, lo, while she yet talked with the king, Nathan the prophet came in.

And it was told Solomon, saying, Behold, Adonijah feareth king Solomon; for, lo, he hath laid hold on the horns of the altar, saying, Let king Solomon swear unto me first that he will not slay his servant with the sword.

behold, I have done according to thy word: lo, I have given thee a wise and an understanding heart; so that there hath been none like thee before thee, neither after thee shall any arise like unto thee.