Dhamma Verses (Dhammapada, KN 2)

5: The Chapter about Fools – 74
Ascetism is useless without Dhamma
For many years the naked ascetic Jambuka ate excrement and
slept on the floor yet convinced his devotees that he only ate
food from a grass-tip and never slept, until the Buddha
confronted him with his deceit; Jambuka repented, ordained
and soon became an Arahat; the Buddha spoke this verse to
Jambuka’s devotees.
70. Māse māse kusaggena bālo bhuñjetha bhojanaṁ,
na so saṅkhātadhammānaṁ kalaṁ agghati soḷasiṁ.
From month to month the fool may eat
food with the tip of kusa-grass,
but he’s not worth a sixteenth part
of those who have mastered Dhamma.