'Lo' in the Bible

And Abram said, Lo, to me thou hast given no seed, and behold, a son of my house will be mine heir.

and he looked toward Sodom and Gomorrah, and toward all the land of the plain, and beheld, and lo, a smoke went up from the land as the smoke of a furnace.

And it came to pass on the next day that the first-born said to the younger, Lo, I lay last night with my father: let us give him wine to drink to-night also, and go thou in, lie with him, that we may preserve seed alive of our father.

Behold, we were binding sheaves in the fields, and lo, my sheaf rose up, and remained standing; and behold, your sheaves came round about and bowed down to my sheaf.

And Joseph said to the people, Behold, I have bought you this day and your land for Pharaoh: lo, here is seed for you, and sow the land.