Enough is as good as a feast.
Thomas Malory (c. 1415-1471) English writer
Le Morte d’Arthur, Winchester Ed., Book 2 (1485)
(Source)
In the original, "Inowghe is as good as a feste." This is the earliest surviving reference to this phrase, which is later labeled proverbial. The text is in the Winchester edition, not the Caxton one (at the end of Book 5, ch. 12).