It is said that after the Buddha's death, the Order charged Ananda with this offence, among others, of introducing women to the Order, and so causing its decay.
The following is Buddha's reply to Ananda after the latter announced that Mahapajapati had undertaken the eight important rules (Anguttara Nikaya, iv. 84):
"Ananda, if women had not been permitted to go forth from the home unto the homeless life under the Norm-Discipline set forth by the Tathagata, then would the righteous life last long, the Good Norm would last, Ananda, a thousand years. But now, Ananda, since women have been permitted to go forth from the home unto the homeless life... not for long will the righteous life prevail; only for five hundred years, Ananda, will the Good Norm stand fast.
Just as, Ananda, whatsoever families have many women and few men are easily molested by robbers and pot-thieves, even so, Ananda, under whatsoever Norm-Discipline womenfolk get permission to wander forth from the home unto the homeless life, not for long does that righteous life prevail.
Just as, Ananda, when the blight called mildew falls upon a blooming paddy-field does not last long, even so, Ananda, under whatsoever Norm-Discipline womenfolk get permission to wander forth from the home unto the homeless life, not for long does that righteous life prevail.
Just as, Ananda, when the blight called red-rust falls upon a blooming field of sugar-cane, that field of sugar-cane does not last long, - even so, Ananda, under whatsoever Norm-Discipline... that righteous life does not last long.
Now just as, Ananda, a man cautiously build an embankment to a great waterwork, to prevent the water from flowing out, - even so, Ananda, have I cautiously proclaimed these Eight Important Rules, not to be broken as long as life shall last."