When this was said, the Buddha said to Māra, “Relax, Wicked One. The full extinguishment of the Realized One will be soon. Three months from now the Realized One will be fully extinguished.”

So at the Cāpāla Shrine the Buddha, mindful and aware, surrendered the life force. When he did so there was a great earthquake, awe-inspiring and hair-raising, and thunder cracked the sky.

Then, understanding this matter, on that occasion the Buddha expressed this heartfelt sentiment:

“Comparing the incomparable <j>with the creation of prolonged life, the sage surrendered the life force. Happy inside, serene, he shattered self-creation like a suit of armor.”

Heartfelt Sayings 6.2 Seven Matted-Hair Ascetics

So I have heard. At one time the Buddha was staying near Sāvatthī in the stilt longhouse of Migāra’s mother in the Eastern Monastery. Then in the late afternoon, the Buddha came out of retreat and sat outside the gate. Then King Pasenadi of Kosala went up to the Buddha, bowed, and sat down to one side.

Now at that time seven matted-hair ascetics, seven Jain ascetics, seven naked ascetics, seven one-cloth ascetics, and seven wanderers passed by not far from the Buddha. Their armpits and bodies were hairy, and their nails were long; and they carried their pack with shoulder-poles.