The term “therefor” often appears in legal texts and is frequently confused with “therefore,” even by native speakers of English. “Therefore” means “consequently,” “for that reason,” “hence,” etc.: “I think, therefore I am.” (Pienso, luego existo). In contrast, phrasal verbs formed with “for” and prepositional phrases containing “for” are sometimes alternately rendered in legal writing as “therefor,” meaning “for that,” “for it:” Thus, “the grounds for the decision” may be expressed as “the grounds therefor,” or the “price paid for necessaries” might appear later in a document as “the price paid therefor.” Likewise, “he qualified for a pension” may be rendered as “he qualified therefor,” “the search for evidence” as “the search therefor” and “liability for damages” as “liability therefor.”

Perhaps it should be noted that the spell checker of the world’s prevailing word processing software is totally ignorant of the existence of the English word “therefor” and will insist on changing “therefor” to “therefore” in any text that you may attempt to type.