Stilla, that sounds right; the Know Jehovah book came out in 1971, only 35 years ago. I hated that book. My favorite scripture from Ezekiel:
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kj chap. 9 pp. 165-167 Marking Foreheads of Those to Be Spared ***WHOSE
FOREHEADS ARE MARKED, AND HOW9
All the people in Jerusalem were in danger of their lives, because Jehovah was about to ‘act in his rage’ in executing his judicial decision against the city. Despite his justified "rage," he would have compassion upon some of its inhabitants. Upon whom? Upon those who were not in sympathy with the detestable things that were being committed at Jehovah’s temple nor with the violence with which the unfaithful religionists were filling the land. (Ezekiel 8:17, 18) There were "men that are sighing and groaning over all the detestable things that are being done" in Jerusalem.
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All these the man with the inkhorn at his waist was to mark in their foreheads, where the mark could be openly seen. For the man in linen to do this, it would require him to go from house to house, from home to home, in order to locate men who were grieved at the way that their God Jehovah was being offended. In order that these sighing and groaning men might be distinguished from the offenders against God, they needed to be marked in their foreheads. This would mark them as true worshipers of Jehovah.
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Of what value would that mark with ink on the foreheads of such pure worshipers of the one living and true God be? This becomes apparent from the official orders that Jehovah next gave to the "six men" armed with weapons for smashing. The prophet Ezekiel tells us what he heard: "And to these others he said in my ears: ‘Pass through the city after him and strike. Let not your eye feel sorry, and do not feel any compassion. Old man, young man and virgin and little child and women you should kill off—to a ruination. But to any man upon whom there is the mark do not go near, and from my sanctuary you should start.’"—Ezekiel 9:5, 6.
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According to those divine instructions any Israelites having their foreheads marked would not be killed off by the "six men." Since the instrument used for killing the unmarked Israelites was a "weapon for smashing," it was likely used in smashing the skulls of those deserving to be executed. How fitting it was, then, that the foreheads of Jehovah’s worshipers were marked, for the "six men" would strike at the head! Seeing a mark on the forehead would hold them back from smashing that head. Age or sex was no reason for an offender against Jehovah to be spared, neither singleness nor marriage. Unmarked parents would not have their minor children marked in the forehead. Hence they would be the ones responsible for the killing of their little children, the Ten Commandments plainly stating that "punishment for the error of fathers" would be brought upon the "sons, upon the third generation and upon the fourth generation." The failure of parents to bring up their children in the pure worship of Jehovah would make such delinquent parents responsible for the outworking of God’s righteous law against their minor children.—Exodus 20:5.