PRELIMINARY PART
Article 9
3. The Constitution guarantees the principle of legality, the hie¬rarchy of legal provisions, the publicity of legal enactments, the non-retroactivity of punitive measures that are unfavourable to or restrict individual rights, the certainty that the rule of law will prevail, the accountability of the public authorities, and the prohibition against arbi¬trary action on the part of the latter.
Nullum crimen sine lege
Nulla poena sine lege
EDIT.