Bhagavad Gita 10.35

बृहत्साम तथा समनान्गाय छंदसमाहम् |
मासानां मार्गशीर्षोऽहमृतूनां कुसुमाकर:

Translation

Amongst the hymns in the Samaveda know me to be the Brihatsama; amongst poetic meters I am the Gayatri. Of the twelve months of the Hindu calendar I am Margsheersh, and of seasons I am spring, which brings forth flowers.