From Middle English faith (also fay), borrowed from Old French fei, feid, from Latin fidēs. Displaced native Old English ġelēafa, which was also the word for "belief."
Old French had as a final devoiced allophone of from lenited Latin ; this eventually fell silent in the 12th century. The -th of the Middle English forms is most straightforwardly accounted for as a direct borrowing of a French . However, it has also been seen as arising from alteration of a French form with -d under influence of English abstract nouns in the suffix -th (e.g. truth, ruth, health, etc.), or as a recharacterisation of a French form like fay, fey, fei with the same suffix, thus making the word equivalent to fay + -th.
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