The Greek that is translated as “for out of the abundance of the heart the mouth speaks” or similar in English is translated in Muna as “what comes-out at the lips, it comes from the fullness/overflowing of the heart.”
René van den Berg explains: “It is very impolite in Muna to mention someone’s mouth (wobha) or tongue (lela). The words themselves are not taboo or obscene, but in combination with a possessor they are frowned upon and should be avoided. In fact, if you want to abuse someone, you should refer to his or her mouth or tongue. The implications for translation are obvious (…). [Sometimes] ‘mouth’ was replaced by ‘lips’ (wiwi), a perfectly acceptable term, even when possessed.”
In the German Luther Bible it says: Denn wes das Herz voll ist, des geht der Mund über or “what the heart is full of, with that the mouth flows over,” in Uab Meto it says “his mouth says only what the heart is more than full of,” and in Tzeltal it is “in our hearts arise all those things which come out of our mouths.” (Source: Reiling / Swellengrebel)