hoti  hot'-ee: demonstrative, that (sometimes redundant); causative, because -- as concerning that, as though, because (that), for (that), how (that), (in) that, though, why.
τρεις adjective - nominative plural masculine
treis  trice:  three -- three.
εισιν verb - present indicative - third person
eisi  i-see': they are -- agree, are, be, dure, is, were.
οι definite article - nominative plural masculine
ho  ho: the definite article; the (sometimes to be supplied, at others omitted, in English idiom) -- the, this, that, one, he, she, it, etc.
μαρτυρουντες verb - present active passive - nominative plural masculine
martureo  mar-too-reh'-o: to be a witness, i.e. testify