四分律刪繁補闕行事鈔 1.57

1.57

If the Dharmaguptaka text provides a judgment with limited scope such that an affair cannot be universally applied, one returns to using the texts of other schools to accomplish the affairs of those other schools. Alternatively, if within two Vinayas both the text and meaning are equally clear, there is no basis for choosing between them; then both are set forth as true Dharma, to be adopted at will. However, when practicing and applying authentic teachings, one must peruse them in person, for fear that hearsay may corrupt the genuine!