I don't know that Jay uses the word "perpetual". He did say:
"Experience disappointed the expectations they had formed from it; and then the people, in their collective and national capacity, established the present Constitution. It is remarkable that in establishing it, the people exercised their own rights and their own proper sovereignty, and conscious of the plenitude of it, they declared with becoming dignity, "We the people of the United States," 'do ordain and establish this Constitution." Here we see the people acting as the sovereigns of the whole country; and in the language of sovereignty, establishing a Constitution by which it was their will, that the state governments should be bound, and to which the State Constitutions should be made to conform."
But perpetual, you say?
"The framers of our Constitution never exhausted so much labor, wisdom and forebearance in its formation, and surrounded it with so many guards and securities, if it was to be broken by every member of the Confederacy at will. It was intended for 'perpetual union' so expressed in the preamble, and for the establishment of a government, not a compact, which can only be dissolved by revolution, or the consent of all the people in convention assembled. It is idle to talk of secession."
Robert E. Lee,January 23, 1861
Walt