Jehangir C. Tavadia

"Not only in grammatical structure and vocabulary, but also in literary form, in certain metres like the TriSTubh and in a way GAyatrI, there is resemblance between the Avesta and the Rgveda. The fact is usually mentioned in good manuals. But there is a peculiarity about these points of resemblance which is not so commonly known: It is the eighth MaNDala which bears the most striking similarity to the Avesta. There and there only (and of course partly in the related first MaNDala) do some common words like uSTra and the strophic structure called pragAtha occur. … Further research in this direction is sure to be fruitful."