Śrīmad-Bhāgavatam · Text 3.6.20
Who is speaking and story frame
गुदं पुंसो विनिर्भिन्नं मित्रो लोकेश आविशत् ।
पायुनांशेन येनासौ विसर्गं प्रतिपद्यते ॥ २० ॥
gudaṁ puṁso vinirbhinnaṁ
mitro lokeśa āviśat
pāyunāṁśena yenāsau
visargaṁ pratipadyate
The evacuating channel separately became manifest, and the director named Mitra entered into it with partial organs of evacuation. Thus the living entities are able to pass stool and urine.
Read this verse on Vedabase.ioThis verse has no purport; its meaning is explained by the verses around it.