Dhamma Verses (Dhammapada, KN 2)

7: The Chapter about the Arahats – 95
The footprint of the one who is free is hard to find
The Buddha and the monks gathered round to help make a
robe for Ven. Anuruddha; a former relative of his, who was
then a goddess, incited the villagers to give alms, which they
did, but the monks suspected Ven. Anuruddha gave the order
for a great alms feast; the Buddha reproved them with this
verse.
93. Yassāsavā parikkhīṇā, āhāre ca anissito,
suññato animitto ca vimokkho yassa gocaro,
ākāse va sakuntānaṁ, padaṁ tassa durannayaṁ.
For him whose pollutants
are destroyed, who is not
dependent on the foods,
for him whose resort is
the liberation that
is empty or signless,
like the birds in the sky,
his footprint’s hard to find.