"nandanandana krsna--mora prana-natha"
ei vakye vikainu tanra vamsera hata
nanda-nandana krsna—Krsna, the son of Nanda Maharaja; mora prana-natha—my life and soul; ei vakye—because of this statement; vikainu—I became sold; tanra—of him; vamsera hata—in the hands of the descendants.
Sri Caitanya Mahaprabhu said, " 'Krsna, the son of Nanda Maharaja, is my life and soul.' By this statement I am sold into the hands of the descendants of Gunaraja Khan.
The full verse referred to here is:
eka-bhave vanda hari yoda kari' hata
nandanandana krsna--mora prana-natha
Link to this page: https://prabhupadabooks.com/cc/madhya/15/100