Lord Vamandeva, the protector of brahman-dharm, once said to Sri Sukrachtya, the foremost of the Bhrigu dunasty brahmans and the guru of the demons – Your disciple Bali Maharaj has undergone many difficulties. Please perform the yajna for his welfare.
Sri Shukrachrya replied – My disciple has seen You, he has chanted Your Name and glories. Your rare lotus feet have been placed upon his head. Is my disciple still so impure that I have to perform a yajna to bless him?
Sreemad Bhagavatam (8.23.16) says — There may be many discrepancies in pronouncing mantras, observing the regulative principles in serial order and moreover, there may be discrepancies in regard to time, place, person, articles and paraphernalia. But when Your Lordship’s holy Name is chanted, everything becomes faultless.
Source: Dasavatar by His Divine Grace Srila Bhakti Ballabh Tirtha Goswami Maharaj