Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 54.53

54.53

yogābhyāsaratāḥ kecit keciddhyāyanti tatpadam /
śīrṇaparṇāśinaḥ kecit kecicca kaṭukāśanāḥ //

some engaged in the practice of yoga, some meditating on that ultimate state,
some feeding on withered leaves, and some eating bitter food;