Kummopamasutta 1.8

1.8

Yadā kho, bhikkhave, kummo kacchapo soṇḍipañcamānaṃ aṅgānaṃ aññataraṃ vā aññataraṃ vā aṅgaṃ na abhininnāmi, atha siṅgālo kummamhā nibbijja pakkāmi, otāraṃ alabhamāno.

But when that tortoise didn’t stick one or other of its limbs or neck out from its shell, the jackal left disappointed, since it couldn’t find a vulnerability.