* Lested: This is the past tense and past participle of the verb "to lest," which is an archaic word meaning "to listen" or "to attend." It's very rarely used today.
* Listed: This means to be included on a list.
* Lest: This is a conjunction used to introduce a clause expressing a reason for something. It means "for fear that" or "in case that."
To determine the correct spelling, you need more context. What were you trying to say?