תלמוד על כתובות 11:3

MISHNAH: Rebbi Jehudah says, if he wants he writes for a virgin a contract of 200 [zuz] and she writes “I received 100 from you”, or for a widow a mina and she writes “I received 50 from you.⁴⁴Obviously the woman must agree to the smaller sum.” Rebbi Meïr says, anyone who diminishes [the ketubah] of a virgin below 200 or that of a widow below 100 is engaging in whoring copulation⁴⁵For him, the sums of 100/200 zuz are the absolute minimum. He admits that there are places where one does not write a ketubah document; this fact does not diminish the amount of ketubah due..