Śrīmad-Bhāgavatam · Text 10.85.3
Who is speaking and story frame
कृष्ण कृष्ण महायोगिन् सङ्कर्षण सनातन ।
जाने वामस्य यत् साक्षात् प्रधानपुरुषौ परौ ॥ ३ ॥
kṛṣṇa kṛṣṇa mahā-yogin
saṅkarṣaṇa sanātana
jāne vām asya yat sākṣāt
pradhāna-puruṣau parau
[Vasudeva said:] O Kṛṣṇa, Kṛṣṇa, best of yogīs, O eternal Saṅkarṣaṇa! I know that You two are personally the source of universal creation and the ingredients of creation as well.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.