'Lo' in the Bible

For finding fault, He saith to them, 'Lo, days come, saith the Lord, and I will complete with the house of Israel, and with the house of Judah, a new covenant,

Then said I, Lo, I come (in the volume of the book it is written of me,) to do thy will, O God.

Then said he, Lo, I come to do thy will, O God. He taketh away the first, that he may establish the second.