That is in Rikved
The rigveda contains and seems to preserve more common elements fromthe Proto-Indo-European Culture than any other branch of the family. Thisessay examines various points of language, poetry and philosophy but itfocuses mainly on grammatical elements, lexical and syntactical, and onaspects of (ﬁne) poetry. This is one aspect showing that Vedic and itsculture is much closer to the PIE language and culture than any otherbranch in that family. Moreover, it shows that it is most unlikely that Vedicmoved across thousands of miles over difﬁcult terrains to come to rest inwhat is today N-W India and Pakistan, in Saptasindhu or the Land of theSeven Rivers. Certain other aspects show that Iranian moved away fromVedic and Saptasindhu and most probably the other branches did the sameat a very distant but undetermined period. Finally, monotheism is also anotable feature in the RV despite its pronounced polytheism.
Also to note the truthfulness of the indologist when he says
''I have not spoken explicitly of the origins of Indian Civilization. It should be obvious, however,
that I regard the rise of the Vedic Culture as indigenous and not the result of an (Aryan or protoIndo-European) invasion or immigration.
I cannot speak of the origin of this Civilization because I do not know it. And I don’t think
anybody else does.''
so guys say something that comes to your mind.link