from the Mahavastu:
And scornfully the king continued: ‘Now you will have an opportunity to show your passion for patience!’ And, as one who cuts a lotus from its stalk, so he cut off with his sharp sword the Sage’s right hand ….
Though his hand was cut off, he yet felt no pain, so firm his adherence to patience;
His pain lay in seeing the terrible fate this butcher, accustomed to pleasure, would meet in the future.
But the Bodhisattva [the Sage] kept silent, because he regarded the king as someone who was beyond help and who could not possibly be won over by kindness. He sorrowed for him as for a patient whom the doctors have given up. The king, however, spoke to him in a threatening matter:
And so your body will be carved to pieces till you die!
Stop this pose of piety! Your roguish cunning shall be stopped!
But the Bodhisattva said nothing, because he knew him for a person who could not be won over by affection, and recognized that he would persist anyhow. So the king in the same manner cut off the other hand of that great-souled man, and thereafter both his arms, his ears and nose, and his feet.
No sorrow and no anger felt the Muni, when the sharp sword his frame demolished.
This engine of the body must run down, he knew, and years of practice had accustomed him to patience.
And when he saw his limbs drop off, this holy man, unbroken, firm and patient, felt but exaltation,
No pain at all. What gave him anguish was to see the king so far estranged from Dharma.
— — —
Conze, E. (1959). Buddhist scriptures. Harmondsworth, Middlesex: Penguin Books, pp.29-30.
See also Radical Empathy as Protection or don’t.