Although Ben saw the girl cheating he did not want to cast the first stone.

本虽然看见那女孩作弊，但不愿带头揭发她。

Don't cast the first stone.

不要掷第一块石头。

Let he who is without sin cast the first stone.

你们中间谁是没有罪的，谁就可以先拿石头打他。

Let he who is without sin cast the first stone!

让无罪之人投第一块石头！

Let him who has no sins cast the first stone. ;

让清白无罪的人先扔出第一个石头（去打击坏人）吧。

Though I see him cheat, I do not want to cast the first stone.

虽然我看见他作弊，但我不想带头发炮。

I hope they share the same mentality and decide to blow up a few of our nuclear power plants before we cast the first stone.

希望他们共同的想法就是在我们采取任何行动之前，先行炸掉一些核工厂。