What is the evidence for distinguishing between the mosque being the earlier structure or the grave?

The questioner : There is a point of difficulty regarding the distinction between the grave preceding the mosque and the mosque preceding the grave. What is the evidence for this distinction?

The Shaykh : The evidence is that the Messenger of Allah (peace and blessings be upon him) forbade building mosques over graves, and he said: . The one that was taken as a precedent was the earlier one. However, if the grave is the later one, then the mosque was established and designated for prayer, so it is not permissible to utilize it for anything other than prayer. This is the difference.