Saṃyutta Nikāya 43
Connected Discourses on the Unconditioned
11. The Eightfold Path
… “And what, bhikkhus, is the path leading to the unconditioned? The Noble Eightfold Path: this is called the path leading to the unconditioned.
“Thus, bhikkhus, I have taught you the unconditioned and the path leading to the unconditioned…. This is our instruction to you.”