Just few fragments remain of the XII Tables, foundamentals of the traditional Roman Law. In particular the X table was focused on Ius Sacrum or the Divine Law. Very few fragments remain of this Table and often we can find some indications through some Latin writers who cite them.In this way, we can identify some basic rules to "Colere Deos" according to the mos maiorum.
Ad Divos adeunto caste
Qui secut faxit
Deus ipse vindex erit
May they approach the Gods and Goddesses while pure and chaste,
and leaving riches behind.
Whosoever should do otherwise,
will be avenged upon by the God Himself.
Cicero, De legibus, 2, 8-9