As per Gaudiya Vaishnavism websites, the below verse is said to have spoken by Krishna in Matsya Purana:
Mundo gaurah su-dirghangas
Meaning: In the age of Kali, I shall advent where the three rivers meet. I shall have a shaven head. I shall have a golden complexion. I will be very kind and always chant the holy name of Krishna.
Where this verse is located?