維摩經略疏垂裕記 4.9

4.9

二、「若三」下，結顯。「三土四土」者，荊溪云：於四土中合於方便及以同居，皆應土故，故云三也。

Second, from "If three" downward, concluding revelation. As for "three lands, four lands," Jingxi says: among the four lands, combining the [land of] expedients and the shared dwelling, because they are both response lands, it therefore says three.