Fear not works because it's a fixed expression. The others sound very odd. Heed them not / Forsake them not would be better, though they do indeed sound old-fashioned.
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AnonymousI believe the phrase "fear not" means something like "don't fear." Now, could we use this "verb+not" pattern for others, too? Would these be correct, eventhough they may sound old-fashioned?Thank you in advance for your help.They are too old-fashioned to use in anything but poetry and historical novels.