Hello and Hare Krishna,
I'm just curious and wish to know in which vedic scripture it's mentioned that Vishnu (all 3 forms of Vishnus) are expansions of Krishna.

I know that in the Gita, Lord Krishna in his many verses has explained that he is the cause of all causes.
And also in the Brahma samhita, the four headed Brahma has said that Govinda (Krishna) is the supreme.
But i'm in search of a verse, that says explicitly, that Vishnu is an expansion of Krishna.

Are there any such verse? If so then please share.

Thank You.