'Twain' in the Bible

He went in therefore, and shut the door upon them twain, and prayed unto Jehovah.

Above him stood the seraphim: each one had six wings; with twain he covered his face, and with twain he covered his feet, and with twain he did fly.

And I will give the men that have transgressed my covenant, that have not performed the words of the covenant which they made before me, when they cut the calf in twain and passed between the parts thereof;

Also, thou son of man, appoint thee two ways, that the sword of the king of Babylon may come; they twain shall come forth out of one land: and mark out a place, mark it out at the head of the way to the city.

And the voice of a multitude being at ease was with her: and with men of the common sort were brought drunkards from the wilderness; and they put bracelets upon the hands of them twain , and beautiful crowns upon their heads.