From the earliest vedic period ‘shukla yajurveda ‘(in mAdhyandina sub recension ) was prevalent in nepAlamandala. ( only HindurAshtra Nepal ). Famous kingdom of ‘videharAja janaka ‘ actually will have included some parts of the nepAlamandala
. These then would be the
earliest literary references and material remains of Vedic culture in nepAl. There are several authentic and peculiar ritual handbooks belonging to mAdhyandina shAkhA in nepAlamandala . It seems that in nepAl of the 15th century, the old way of Veda recitation as described by the great grammarian pAninI was still extant, while it had died out in this form in most parts of India. Today, this type of recitation survives only with some families in kerala. It would, therefore, seem that the older way of Vedic recitation, which dates back even to earliest vedic times (i. e. pronouncing the UddAta, and not the svarita as the syllable with the highest tone) . The medieval Vedic transmission and the actual recital of the texts therefore seems to have been very conservative and faithful in nepAl. On the other hand, there was a considerable influence of the North Indian traditions, coming with the maithilI Brahmins.
While undergoing a nepAlI treaties ‘ bAlabodhinI rUdrAbhisheka paddhati ‘ (बालबोधिनी रुद्राभिषेकपद्धति ) I came to know about a peculiar form of mahAnyAsaM prevalent only in practice of vAjasaneya brahmins ( or shuklayaju-shAkhAdhyAyins )of nepAlamanda. Deviating from shuklayajurveda-sarvAnukrama sutra ( a treatise describing rishI , devatA ,chhanda of mAdhyandina samhitA ),it mentions of peculiar rishIs and devatAs for the mantras.
The treatise neither mentions of the original source from where these version of mahAnyAsaM is taken nor of peculiar vinIyogas. A tantric infulence is also their on this version , as it starts nyAsa procedure from SrI kanTha mAtrUkAnyAsa (श्री कण्ठ मातृकन्यास ).( a pure shaiva tantric nyAsa ). Then laghunyAyasaM is performed, also several nyAsaMs are performed by mantras of rUdrI . In last a purvapujA is performed to lord shiva .Of course the instructions are in nepAl bhAshA but mantras are in Sanskrit. The script is of devanAgrI lipI .
1) बालबोधिनी रुद्राभिषेकपद्धति
2) Veda in Nepal (A research paper by Dr. Witzel )