Ezekiel 33:3 in the World English Bible
if, when he sees the sword come on the land, he blows the trumpet and warns the people,
Context
2 Son of man, speak to the children of thy people, and say unto them, When I bring the sword upon a land, if the people of the land take a man of their coasts, and set him for their watchman:
3 If when he seeth the sword come upon the land, he blow the trumpet, and warn the people;
4 Then whosoever heareth the sound of the trumpet, and taketh not warning; if the sword come, and take him away, his blood shall be upon his own head.