Quoting Hendrik Boom (hendrik@???):

> I believe the Google slogan was "Don't be evil." "First, do no harm" is
> from the English translaation of the Hippocratic Oath.

Strictly speaking, that's from 17th C. Latin, really.
https://en.wikipedia.org/wiki/Primum_non_nocere

In general, though, I've often said 'ὄμνυμι Ἀπόλλωνα ἰητρὸν καὶ
Ἀσκληπιὸν καὶ Ὑγείαν καὶ Πανάκειαν καὶ θεοὺς πάντας τε καὶ πάσας,
ἵστορας ποιεύμενος, ἐπιτελέα ποιήσειν κατὰ δύναμιν καὶ κρίσιν ἐμὴν ὅρκον
τόνδε καὶσυγγραφὴν τήνδε.'


(Prayers to Πανάκειαν do tend to help in debugging code. ;-> )