大般涅槃經義記 9.260

9.260

次列其名，三門分別：一就三乘別行分別、二就三乘共行分別、三就三乘通行分別。

Next, enumerating their names, there are distinctions according to three approaches: first, distinguishing according to the separate practices of the three vehicles; second, distinguishing according to the shared practices of the three vehicles; third, distinguishing according to the common practices of the three vehicles.