Faith
Middle English: from Old French feid, from Latin fides .
wiktionary
From Middle English faith, fayth, feith, feyth (also fay, fey, fei("faith"); > English fay(“faith”)), borrowed from Old French fay, fey, fei, feit, feid(“faith”), from Latin fidēs(faith, belief, trust; whence also English fidelity), from fīdō(“trust, confide in”), ultimately from Proto-Indo-European *bʰidʰ-, zero-grade of *bʰeydʰ-("to command, persuade, trust"; whence also English bide). Displaced native Old English geleafa(“faith, religion”), which was a cognate of Dutch geloof(“permission”), which is survived in English leave(“permission”).
Old French had [θ] as a final devoiced allophone of /ð/ from lenited Latin /d/; 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 [θ]. 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.
etymonline
faith (n.)
mid-13c., faith, feith, fei, fai "faithfulness to a trust or promise; loyalty to a person; honesty, truthfulness," from Anglo-French and Old French feid, foi "faith, belief, trust, confidence; pledge" (11c.), from Latin fides "trust, faith, confidence, reliance, credence, belief," from root of fidere "to trust,"from PIE root *bheidh- "to trust, confide, persuade." For sense evolution, see belief. Accommodated to other English abstract nouns in -th ( truth, health, etc.).
From early 14c. as "assent of the mind to the truth of a statement for which there is incomplete evidence," especially "belief in religious matters" (matched with hope and charity). Since mid-14c. in reference to the Christian church or religion; from late 14c. in reference to any religious persuasion.
And faith is neither the submission of the reason, nor is it the acceptance, simply and absolutely upon testimony, of what reason cannot reach. Faith is: the being able to cleave to a power of goodness appealing to our higher and real self, not to our lower and apparent self. [Matthew Arnold, "Literature & Dogma," 1873]
From late 14c. as "confidence in a person or thing with reference to truthfulness or reliability," also "fidelity of one spouse to another." Also in Middle English "a sworn oath," hence its frequent use in Middle English oaths and asseverations (par ma fay, mid-13c.; bi my fay, c. 1300).
