NT.filter - kjv IRON:

kjv@Acts:12:10 @ When they were past the first and the second ward, they came unto the iron gate that leadeth unto the city; which opened to them of his own accord: and they went out, and passed on through one street; and forthwith the angel departed from him.

kjv@1Timothy:4:2 @ Speaking lies in hypocrisy; having their conscience seared with a hot iron;