Just as [with] two, [if] one of them is found [to be] a kinsman or a disqualified [witness], their testimony is void, so too [with] three, [if] one of them is found [to be] a kinsman or a disqualified [witness], their testimony is void. How do we know that [this is so] even [for] a hundred? To teach [this] it states: witnesses. Said R' Yose: In regard to what is this said? In regard to capital cases; but in regard to civil cases, the testimony is estab-lished through the remaining [witnesses]. Rabbi says: Both in civil cases and in capital cases, but only if they warned them. But if they did not warn them —- what should two brothers do who saw someone commit a murder?