Garudapurana 3.14.45

3.14.45

mantreṇa pretadahanamasāraṃ parikīrtitam /
havirnārāyaṇo devo etāṃśca hyaśubhānra sān //

and the cremation of a corpse with mantras are declared devoid of essence. / Lord Nārāyaṇa, the sacrificial offering, indeed does not receive these inauspicious saps;