you must enchant a tool but it might not be fire aspect all the time.
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When you have fire aspect in Minecraft, whenever you hit a target with a bow or sword the target will start on fire.
You need to be level 26 or higher
You need to enchant it at an enchanting table, and hope you get the Fire Aspect enchantment.
25
Diamond sword enchanted to Sharpness V + Fire Aspect III.