Which Niger-Congo language appeared in the first extant book written in an African language?

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Thematic map of Africa showing the distribution of Niger-Congo language branches. Distinct colors represent language groups such as Atlantic, Mande, Gur, Kwa, Benue-Congo, and Bantu, with Bantu languages covering most of central, eastern, and southern Africa. A numbered key lists prominent languages in each area, and country borders are marked for reference. — Niger-Congo languages Map showing the branches and distribution of the Niger-Congo languages.

The first extant book written in a Niger-Congo language was published in 1624 and featured the Kongo language. This 134-page work, authored by three Jesuit priests, consisted of a catechism in Portuguese with an interlinear translation into Kongo.1