Rabbon Shimon ben Gamliel has said there were no such gala-days for
Israel as the fifteenth of Ab and the Day of Atonement, when the young
maidens of Jerusalem used to resort to the vineyard all robed in white
garments, that were required to be borrowed, lest those should feel
humiliated who had none of their own. There they danced gleefully,
calling to the lookers-on and saying, "Young men, have a care; the
choice you now make may have consequences."
THE TALMUD, _Taanith_, fol. 26, col. 2.