Dutiyagaddulabaddhasutta 1.4

1.4

Seyyathāpi, bhikkhave, sā gaddulabaddho daḷhe khīle vā thambhe vā upanibaddho. So gacchati cepi tameva khīlaṃ vā thambhaṃ vā upagacchati; tiṭṭhati cepi tameva khīlaṃ vā thambhaṃ vā upatiṭṭhati; nisīdati cepi tameva khīlaṃ vā thambhaṃ vā upanisīdati; nipajjati cepi tameva khīlaṃ vā thambhaṃ vā upanipajjati.

Suppose a mutt on a leash was tethered to a strong post or pillar. Whether walking, standing, sitting, or lying down, it stays right beside that post or pillar.