So you testify that you approve of what your ancestors did; they killed the prophets, and you build their tombs.
NMVTruly you2f bear witness that you2f allow the deeds of your fathers: for they indeed killed them, and you2f build their sepulchres.
OJBTherefore, you are edim (witnesses) and in agreement with the deeds of your avot, because they do the killing of nevi'im part and you do the providing of the matsevot part.
TCENTSo you bear witness to and approve of the works of your fathers; for they killed the prophets, and you build their tombs.
T4TSo you are declaring that you approve of what your ancestors did. They killed the prophets, and you are not honoring the prophets! You just decorate their tombs!