「千真万确」英文怎么说？

straight from the horse's mouth 

消息是真实的、消息来自可靠来源、绝对可靠的、千真万确的消息

If you don't believe me, go talk to him and hear it straight from the horse's mouth. It's true. 

你不相信我的话，去问问他就好了，让他自己亲自告诉你，这可是真的。

Did you hear that Sally and Bob are going to get married ? I heard it from Bob himself, so it's straight from the horse's mouth. 

你有听说Sally和Bob快要结婚的消息吗？这可是Bob他本人告诉我的，所以就是千真万确的噢！