'Lo' in the Bible

Because, yea because they have seduced my people, saying, Peace! and there is no peace; and one buildeth up a wall, and lo, they daub it with untempered mortar --

And lo, when the wall is fallen, shall it not be said unto you, Where is the daubing with which ye have daubed it?

But lo, if he have begotten a son that seeth all his father's sins which he hath done, and considereth, and doeth not such like:

And he brought me the way of the north gate before the house; and I beheld, and lo, the glory of Jehovah filled the house of Jehovah: and I fell upon my face.