Bhagavad Gita Chapter 10.35
b?hat-sama tatha samna?
gayatri chandasam aham
masana? marga-sir?o ’ham
?tuna? kusumakara?
Translation
Of the hymns in the Sama Veda I am the Brihat-sama, and of poetry I am the Gayatri. Of months I am Margasirsa [November-December], and of seasons I am flower-bearing spring.