Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 4
Sanskrit:
इति मूढ: प्रतिज्ञाय देवं पशुपतिं प्रभुम् ।आराधयामास नृप: पांशुमुष्टिं सकृद्ग्रसन् ॥ ४ ॥
ITRANS:
iti mūḍhaḥ pratijñāyadevaṁ paśu-patiṁ prabhumārādhayām āsa nṛpaḥpāṁśu-muṣṭiṁ sakṛd grasan
Translation:
Having thus made his vow, the foolish King proceeded to worship Lord Paśupati [Śiva] as his deity by eating a handful of dust each day, and nothing more.