Skandapurana 2.7.0.p19

2.7.0.p19

adhyāyaḥ 19 brahmaśavdapratipādanapūrvakaṃ sarvadevāpekṣayāḥ prāṇasya mukhyatvakathanam ,prāṇadevasya mahattvalope kaṇvaśāpapratipādanam, tvaṃ gurudrohī bhaveti kaṇvaṃ prati prāṇavāyunā śāpapradānam

Chapter 19: The declaration of the primacy of Prāṇa above all deities preceded by the exposition of the word 'brahman'; the declaration of the curse of Kaṇva upon the diminishment of the greatness of the god Prāṇa; the pronouncement of the curse by the breath-wind Prāṇa upon Kaṇva: 'Be one who betrays his guru!'