god's law (Matt 5:18)

Matthew 5:18

Truly, I say to you, until heaven and earth pass away not an iota, not a dot will pass from the law until all is accomplished

Why should we believe the old testament? Because Jesus did. Jesus seems to think that every word matters - he says that neither the smallest greek (iota) or hebrew (dot) letter will pass from the law until everything has been accomplished. He says that heaven and earth will pass away before God's law - God's law being the constant by which we evaluate the culture of the particular time and place we live in, not our culture evaluating the bible. Treating the bible as our highest authority is unfashionable and counter-cultural, even in churches! But that's the attitude Jesus had and we should follow.