Revelation 1:16

and he had in his right hand seven stars, and out of his mouth there went a sharp two-edged sword; and his countenance was as the sun, when he shines in his strength.

Revelation 2:12

And by the messenger of the congregation which is in Pergamos, write: These things says he who has the sharp two-edged sword:

Treasury of Scripture Knowledge

Summary

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.

Bible References

Two edges

Revelation 1:16
and he had in his right hand seven stars, and out of his mouth there went a sharp two-edged sword; and his countenance was as the sun, when he shines in his strength.
Revelation 2:12
And by the messenger of the congregation which is in Pergamos, write: These things says he who has the sharp two-edged sword: