When the Lord’s two nostrils separately manifested themselves, the dual Aśvinī-kumāras entered them in their proper positions, and because of this the living entities can smell the aromas of everything.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
निर्भिन्ने अश्विनौ नासे विष्णोराविशतां पदम् । घ्राणेनांशेन गन्धस्य प्रतिपत्तिर्यतो भवेत्
nirbhinne aśvinau nāse viṣṇorāviśatāṃ padam | ghrāṇenāṃśena gandhasya pratipattiryato bhavet
SB 3.6.14