“The school of Shammai say: A man may not divorce his wife unless he finds in her a matter of lewdness, as it says, "If he finds in her an unseemly thing" (Deuteronomy 24:1), but the school of Hillel say: Even if she burnt his food, as it says, "If he finds in her an unseemly thing". Rabbi Akiva says: Even if he found one more beautiful than she, as it says, "If she should not find favor in his eyes" [Mishna Gittin 9:10]
2. D.A. Carson & Beale comment on a view that all the Rabbis seem to have held, “Although there was general agreement on matters such as infertility, unfaithfulness, and neglect….’no fault’ divorces were the center of contention.” [Commentary on NT Use of OT, p. 197]