[IDEM libro trigesimo quarto ad edictum. ] §50.16.189.pr'Facere oportere' et hanc significationem habet, ut abstineat quis ab eo facto, quod contra conuentionem fieret, et curaret ne fiat.
[THE SAME, in the thirty-fourth book on the Edict.] 'To be obliged to do' also has this meaning, that one should abstain from that act which would be done contrary to the agreement, and should see to it that it does not happen.