Shiva Purana
यदि पूजा न जाता चेन्न भुनक्ति तदा तु सः ॥ अतस्तत्रापि वैश्योऽसौ चकार शिवपूजनम् ॥ ४४ ॥
If on any day he could not worship Śiva he did not take his food. The Vaiśya performed the worship of Śiva there in the prison also.
english translation
yadi pUjA na jAtA cenna bhunakti tadA tu saH ॥ atastatrApi vaizyo'sau cakAra zivapUjanam ॥ 44 ॥
hk transliteration by Sanscript