Исток буддийской тантры Дхарани-питаки Дхармагуптаки с Махасангхикой. Тогда и Атхарваведы не было.

The dating of M-N-S is also dependent on the commentators. These include Candragomin; and if he is the eminent Buddhist grammarian, he has been placed in the placed in the first half of the sixth century. There is more than one Candragomin; and M-N-S commentator is reasonably to be indentified with the one who wrote the commentary in the cycle of the"Twenty-one Praises of Tara," probably in the eight century, where is also the M-N-S shows influence of the Tathagatagarbha theory, specificially the three kinds of Tathagatagarbha thah are set forth in a basic scripture of this tradition, the Sri- Maladevisimhanada-sutra, which was first translated into Chinese in the early fifth century, where it was very popular for about a century thereafter. The M-N-S cannot be earlier than this popularity. Also, it is preceded by the Manjusri-mula-kalpa (meaning the first two published volumes, not the later third volume devoted to legends and prophecy), which may belong to the fourth century as a kind of early Buddhist Tantra. Taking all the evidence into consideration, the M-N-S should be placed in either the sixth or seventh centuries, and i suppose that the seventh century is more realistic.
Alex Wayman - Chanting the Names of Mañjuśrī: The Mañjuśrī-nāma-saṃgīti, Sanskrit and Tibetan Texts