Tip o’ the pileus to Virginia Knight who sent in a piece from the Guardian about the first acts of Bristol’s newly-elected mayor … right at the end, we read:
[…] Ferguson completed his speech by asking everyone present to join him as he took the oath made by young men of Athens when they became citizens: “I shall not leave this city any less but rather greater than I found it.”
- via: Mayor to take salary in Bristol pounds (Guardian)
If you’re wondering about the ‘full’ oath, it’s Lycurgus’ Against Leontines … Wikipedia is actually rather good with this one.