Mv 6.40.1
PTS: Horner vol. 4, p. 347
Vinaya-samukkamsa: The Innate Principles of the Vinaya
by
Thanissaro Bhikkhu

Now at that time uncertainty arose in the monks with regard to this and that item: "Now what is allowed by the Blessed One? What is not allowed?" They told this matter to the Blessed One, (who said):

"Bhikkhus, whatever I have not objected to, saying, 'This is not allowable,' if it fits in with what is not allowable, if it goes against what is allowable, this is not allowable for you.

"Whatever I have not objected to, saying, 'This is not allowable,' if it fits in with what is allowable, if it goes against what is not allowable, this is allowable for you.

"And whatever I have not permitted, saying, 'This is allowable,' if it fits in with what is not allowable, if it goes against what is allowable, this is not allowable for you.

"And whatever I have not permitted, saying, 'This is allowable,' if it fits in with what is allowable, if it goes against what is not allowable, this is allowable for you."