अथ ह प्राणमूचुस्त्वं न उद्गायेति ।तथेति तेभ्यः प्राण उदगायत् ।यः प्राणे भोगस्तं देवेभ्य आगायत् ।यत्कल्याणं जिघ्रति तदात्मने ।तेऽविदुरनेन वै न उद्गात्रात्येष्यन्तीति ।तमभिद्रुत्य पाप्मनाविध्यन् ।स यः स पाप्मा यदेवेदमप्रतिरूपं जिघ्रति ।स एव स पाप्मा ॥बृह. १,३.३ ॥
In plain words
Then they said to the breath in the nose, "Sing the Udgītha for us." "So be it," said the breath, and sang the Udgītha for them. Whatever enjoyment there is in smell, that it sang for the gods; but the smelling of what is fair it kept for itself. The demons knew, "By this singer they will overcome us." They rushed upon it and pierced it with evil. That evil is the smelling of what is unseemly; that is the evil.