Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 43
Sanskrit:
त एनमृषयो राजन् वृता धर्मेण धार्मिकम् ।तस्मिन्नयाजयन् क्षेत्रे मखैरुत्तमकल्पकै: ॥ ४३ ॥
ITRANS:
ta enam ṛṣayo rājanvṛtā dharmeṇa dhārmikamtasminn ayājayan kṣetremakhair uttama-kalpakaiḥ
Translation:
Thus requested by him, O King, the sages engaged the pious Vasudeva in performing fire sacrifices at that holy place of Kurukṣetra according to strict religious principles and with most excellent ritual arrangements.