法界次第初門 2.228

2.228

五、六入。從名色中生眼等六情，是名六入。從五皰初開已來，即是六入名也。

Fifth, the six sense bases: from within nāmarūpa arise the six sense faculties, such as the eyes; these are called the six sense bases. From the initial opening of the five vesicles onward, this is what is called the six sense bases.