Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 7

Sanskrit:

वैदिकस्तान्त्रिको मिश्र इति मे त्रिविधो मख: ।त्रयाणामीप्सितेनैव विधिना मां समर्चरेत् ॥ ७ ॥

ITRANS:

vaidikas tāntriko miśraiti me tri-vidho makhaḥtrayāṇām īpsitenaivavidhinā māṁ samarcaret

Translation:

One should carefully worship Me by selecting one of the three methods by which I receive sacrifice: Vedic, tantric or mixed.

Purport:

Vaidika refers to sacrifice performed with mantras from the four Vedas and auxiliary Vedic literature. Tāntrika refers to such literatures as the Pañcarātra and the Gautamīya-tantra. And “mixed” indicates utilization of both literatures. It should be remembered that superficial imitation of elaborate Vedic sacrifices will not bring one the actual perfection of life. One must perform sacrifice according to the prescription of the Supreme Lord, who recommends for this age the chanting of His holy names: Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare.