Answer by Suminda Sirinath S. Dharmasena for Why Buddha said "if you want to remove small/light codes from Vinaya"?

If the Buddha had totally approved the removal of certain rules then the Buddha would have explicitly mentioned which ones.

In the 1st Council the monks could not decide what extent was minor rules, so ultimately decided to keep all the rules with the fault of not clarifying being with Ven. Ananda when the mentioned this.

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