QEF

The story

1. Ancient Greek · derived fromὅπερ ἔδει ποιῆσαι
2. Latin · derived fromquod erat faciendum“what was to have been done”
3. English todayQEF

From Latin quod erat faciendum (“what was to have been done”), from Ancient Greek ὅπερ ἔδει ποιῆσαι (hóper édei poiêsai).