In viiii. libro codice titulo de calumniatoribus [Cod. 9.46.10] Imperatores Honorius et Theodosius "Quisquis crimen intendit non inpunitam noverit fore licentiam mentiendi cum calumniantes ad vindictam poscat similtudo supplicii."  Interlinear gloss: "In priuatis uero uel extraordinariis criminibus calumpnosi extra ordinem pro qualitate admissi puniuntur (plectuntur recte)."  quoting Dig. 48.16.3 verbatim	Sankt Gallen, Stiftsbibliothek 673, p.66	C.3 (C.2) q.8 c.4: Sixtus papa. Qui crimen obicit sciat se probaturum.   Qui non probaverit quod obiecit, pęnam quam intulit ipse patiatur. Pseudo-Isidore Collectio Tripartita 1.44.4 is the only major collection that attributes the text to Sixtus in Pulsatus; the Collectio Catalaunensis I also contains the text attributed to Sixtus Tripartita ed. Brett, Brasington et alii In all other collections the text is attributed to Fabianus papa or Ex concilio arausico (Orange), Pseudo Isidore (1863) p. 168 [Cf. C.4(C.3) q.6 c.1 (Fabianus papa ibi inquit)] Gratian C.4(C.3) q.6 c.18 (Adrianus papa) Gratian 2 does not add a text of Roman law to make the same point; Cf C.2 q.8 c.2 = Cod. 4.19.25
Pseudo-Isidore (1863) p. 563 JK † 397