Justinian's Digest 1.1.1 De iustitia et iure
Torino, Biblioteca Nazionale E.I.1.c4
Accursius, to Authentica Quod eis at Cod. 5.4.23 (=Nov. 51).

s.v. pena x. librarum auri: “nota quod tria debet continere iuramentum: veritatem, iustitiam et iudicium, quorum si quid defuerit periurus est qui facit, ut xxii. q.ii. Animadvertendum (C.22 q.2 c.2): Note that an oath ought to contain three things: the truth, justice, and judgment. If any of those three are absent, the oath taker commits perjury.”

Maxim: Veritas, Iustitia, Iudicium

Agobardus Lugdunensis (†840), Epistola 15, Collectio XIII librorum 1.64.2, Collectio Caesaraugustana 6.15, Ivo of Chartres, Decretum 12.22, Panormia 8.123, Collectio Tripartita 3.22.17; Laws of Henry I 5.28, Bracton, De legibus et consuetudinibus 3.6, Peter Cantor, Verbum abbreviatum c.147, Thomas Aquinas, Summa theologica 2.2.q.89.3, Franciscus Suarez, De juramento assertorio 1.3, Jacobo Menochio, Consilium 601, Prospero Farinaci, Praxis et theoricae criminalis (Lyon: 1631) 4.140, Ernst Friedrich Pforenhauer, Doctrina Processus cum Germanici tum Saxonici regii (Leipzig: 1826) 145.