The Aes Sedai who beat Rand in Lord of Chaos did not necessarily violate the Three Oaths. Jordan explained that the Three Oaths are bound by literal intent and perception. He said that the Aes Sedai could have considered the beatings a just punishment rather than the use of a weapon. He also suggested that not everything that harms you need be considered a weapon. I think he gave the example of a whip used lightly not considered a weapon, versus a whip used to flay skin being considered a weapon. On the subject of the first Oath (“to speak no word that is untrue”), Jordan said that Aes Sedai can say something they believe to be true or something they don’t mean literally. As an example of the latter, an Aes Sedai can employ hyperbole and say something like, “I’m going to tie your ears over your head,” when she means to do no such thing.
My Comment: I should also point out that at least two of the women who beat Rand are people we know to belong to the Black Ajah. On page 683hb (in Lord of Chaos ), it is said that only Galina, Erian, and Katerine beat Rand more than once. We know that Galina and Katerine are Black Ajah, so they aren’t bound by the Oaths anyway. Erian is the Aes Sedai whose two Warders Rand killed, so maybe she found some way to justify her punishment of Rand under the Three Oaths. I don’t know who else beat Rand (i.e., who beat him only once); the book may say, but I can’t find a quote.
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