The correct spelling of the phrase "does favor" is often debated due to its archaic construction. The correct phonetic transcription of the word "doeth" is /ˈdʌɪəθ/ or "duh-eth." In modern English, this would be spelled as "does." The word "favor" is spelled as /ˈfeɪvər/ or "fay-vur." Together, "doeth favor" is an old-fashioned way of saying "does a favor," and it is not commonly used in contemporary English.
The phrase "doeth favor" is a combination of two words: "doeth" and "favor".
"Doeth" is the third person singular present tense form of the verb "do" in Early Modern English. It comes from the Old English word "dōþ" or "dyþ", which also meant "does" or "performs". Over time, as the English language evolved, "doeth" gradually fell out of common usage, and in modern English, we use "does" instead.
"Favor" comes from the Latin word "favor", which means "esteem" or "approval". It was borrowed into Old French as "favor", and later made its way into Middle English as "favur". The word ultimately derives from the Latin verb "favēre", which means "to show kindness" or "to help".