This summary is not the rule. The rule text controls.
Sometimes a piece of evidence involves someone repeating what another person said, who was in turn repeating what a third person said. This is called "hearsay within hearsay" or "double hearsay." A common example is a written report where the writer describes what someone else told them.
This kind of layered statement can still be used in court, but only if each layer fits its own exception to the hearsay rule. In other words, you cannot just find one exception and use it to cover the whole statement. You have to check each part separately and show that every single piece has a valid reason to be allowed in.
If even one layer of the statement does not fit an exception, that part cannot come in as evidence. This rule protects against using unreliable secondhand information just because part of it happens to be trustworthy.
