Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 26
Sanskrit:
आरभ्यतां धनुर्यागश्चतुर्दश्यां यथाविधि ।विशसन्तु पशून्मेध्यान् भूतराजाय मीढुषे ॥ २६ ॥
ITRANS:
ārabhyatāṁ dhanur-yāgaścaturdaśyāṁ yathā-vidhiviśasantu paśūn medhyānbhūta-rājāya mīḍhuṣe
Translation:
Commence the bow sacrifice on the Caturdaśī day in accordance with the relevant Vedic injunctions. In ritual slaughter offer the appropriate kinds of animals to the magnanimous Lord Śiva.