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CC Ādi 1.72

rāsotsavaḥ sampravṛtto
yogeśvareṇa kṛṣṇena
tāsāṁ madhye dvayor dvayoḥ
rāsa-utsavaḥ — the festival of the rāsa dance; sampravṛttaḥ — was begun; gopī-maṇḍala — by groups of gopīs; maṇḍitaḥ — decorated; yoga-īśvareṇa — by the master of all mystic powers; kṛṣṇena — by Lord Kṛṣṇa; tāsām — of them; madhye — in the middle; dvayoḥ dvayoḥ — of each two.
“When Lord Kṛṣṇa, surrounded by groups of cowherd girls, began the festivities of the rāsa dance, the Lord of all mystic powers placed Himself between each two girls.”

This verse is also quoted from Śrīmad-Bhāgavatam (10.33.3).