I've never heard it. Using babelfish on the supplied link tells me:
"The law of avoided and pears are an expression, and indicate on a being certain appointment or rule to which cannot be unsewed." leaving me as much in the dark as ever.

I also I find that Daniel 6:8 in my Bible is Daniel 6:9 in the Wikipedia' poster's. But I assume that this is the source:
"Now, O king, establish the decree, and sign the writing, that it be not changed, according to the law of the Medes and Persians, which altereth not." Daniel 6:8 KJV