Bhagwad Gita
Chapter 10, Verse 35
बृहत्साम तथा साम्नां गायत्री छन्दसामहम्।
मासानां मार्गशीर्षोऽहमृतूनां कुसुमाकरः।।10.35।।
Of hymns I am the Brhat-sama sung to the Lord Indra, and of poetry I am the Gayatri verse, sung daily by brahmanas. Of months I am November and December, and of seasons I am flower-bearing spring.