Srimad-Bhagavatam: Canto 2 - Chapter 1 - Verse 9
Sanskrit:
पायुर्यमस्य मित्रस्य परिमोक्षस्य नारद ।हिंसाया निऋर्तेर्मृत्योर्निरयस्य गुदं स्मृत: ॥ ९ ॥
ITRANS:
pāyur yamasya mitrasyaparimokṣasya nāradahiṁsāyā nirṛter mṛtyornirayasya gudaṁ smṛtaḥ
Translation:
O Nārada, the evacuating outlet of the universal form of the Lord is the abode of the controlling deity of death, Mitra, and the evacuating hole and the rectum of the Lord is the place of envy, misfortune, death, hell, etc.