The Dairis and the Mitzvah of Binyan

The dairis the mitzvah of binyan based on miktash requires a specific navuah from Akhada sporta and we don't build it on our own. There's really an exception to lobha shaamayimhi that normally for care you keep the taylor without reference to what a navi tells you but the tain tasu the dairis says  you need the sqalas of a navi. The rambhan wants to suggest in rashi interesting thing that was referring to ratios so if something was a square so it has to be a square in the midfish still even though it might be a different