The Baudhāyana sūtras are a group of Vedic Sanskrit texts which cover dharma, daily ritual, mathematics, etc. They belong to the Taittiriya branch of the Krishna Yajurveda school and are among the earliest texts of the genre, perhaps compiled in the 8th to 6th centuries BCE.Source
In the Baudhāyana sūtras we find a very interesting verse :
In case the country is not appropriate, one is without money, then he can normally do puja in his mind or offer this is because Bhagavan says- “those who give me leaf, flower, fruit or water with devotion I eat that which has been offered by my pure minded devotee” .(Baudhayana Grhya Sutra 2.22.9)
"Those who - - - - - - pure minded". This qoute is referring to gita 9:26.
BG 9.26: If one offers to Me with devotion a leaf, a flower, a fruit, or even water, I delightfully partake of that article offered with love by My devotee in pure consciousness.
Baudhāyana sūtras is written in vedic sanskrit Where as gita is written in classical sanskrit. How is this possible.
Gita was revealed in the battle of Mahabharata, the commenly accepted date is 3067 Bce.
But Baudhāyana sūtras was written in around 8th to 6th centuries bce.
So gita predates Baudhāyana sūtras. But how is it possible that gita is written in classical sanskrit and not in vedic sanskrit.
https://hinduism.stackexchange.com/a/45738/22556