Vedic mantras must be enunciated perfectly and chanted with the proper accent; if the priests who are engaged in this business commit any mistake, the checker, or referee priest, immediately corrects the procedure

Expressions researched:
"Vedic mantras must be enunciated perfectly and chanted with the proper accent; if the priests who are engaged in this business commit any mistake, the checker, or referee priest, immediately corrects the procedure"

Krsna, The Supreme Personality of Godhead

Vedic mantras must be enunciated perfectly and chanted with the proper accent; if the priests who are engaged in this business commit any mistake, the checker, or referee priest, immediately corrects the procedure, and thus the ritualistic performances are perfectly executed. Unless perfectly executed, a sacrifice cannot yield the desired result. In this Age of Kali there is no such learned brāhmaṇa or priest available; therefore, all such sacrifices are forbidden. The only sacrifice recommended in the śāstras is the chanting of the Hare Kṛṣṇa mantra.

Krsna Book 74:

Present by the invitation of King Yudhiṣṭhira to participate in the great sacrifice were all the exalted demigods, including Lord Brahmā, Lord Śiva and Indra, the King of heaven, accompanied by their associates, as well as the predominating deities of the higher planetary systems, including Gandharvaloka, Siddhaloka, Janaloka, Tapoloka, Nāgaloka, Yakṣaloka, Rākṣasaloka, Pakṣiloka and Cāraṇaloka, as well as famous kings and their queens. All the respectable sages, kings and demigods who assembled there agreed unanimously that King Yudhiṣṭhira was quite competent to take the responsibility of performing the Rājasūya sacrifice; no one was in disagreement on this fact. Everyone thoroughly knew the position of King Yudhiṣṭhira; because he was a great devotee of Lord Kṛṣṇa, no accomplishment was extraordinary for him. The learned brāhmaṇas and priests saw to it that the sacrifice by Mahārāja Yudhiṣṭhira was performed in exactly the same way as it had been in bygone ages by the demigod Varuṇa. According to the Vedic system, whenever there is an arrangement for sacrifice, the members participating are offered the juice of the soma plant, which is a kind of life-giving beverage. On the day for extracting the soma juice, King Yudhiṣṭhira very respectfully received the special priest who had been engaged to detect any mistake in the formalities of the sacrificial procedure. The idea is that the Vedic mantras must be enunciated perfectly and chanted with the proper accent; if the priests who are engaged in this business commit any mistake, the checker, or referee priest, immediately corrects the procedure, and thus the ritualistic performances are perfectly executed. Unless perfectly executed, a sacrifice cannot yield the desired result. In this Age of Kali there is no such learned brāhmaṇa or priest available; therefore, all such sacrifices are forbidden. The only sacrifice recommended in the śāstras is the chanting of the Hare Kṛṣṇa mantra.