'Edges' in the Bible

It shall have the two shoulderpieces thereof joined at the two edges thereof; and so it shall be joined together.

They made shoulderpieces for it, to couple it together: by the two edges was it coupled together.

But Ehud made him a dagger which had two edges, of a cubit length; and he did gird it under his raiment upon his right thigh.

And to the angel of the church in Pergamos write; These things saith he which hath the sharp sword with two edges;