SB 4.13.27
It is the practice of the brāhmaṇas conversant with the science to pronounce a Vedic mantra in the right accent. The combination of the mantra and Sanskrit words must be chanted with the right pronunciation; otherwise it will not be successful. In this age the brāhmaṇas are neither well versed in the Sanskrit language nor very pure in practical life. But by chanting the Hare Kṛṣṇa mantra one can attain the highest benefit of sacrificial performances. Even if the Hare Kṛṣṇa mantra is not chanted properly, it still has so much potency that the chanter gains the effect.
