CC Ādi 6.48

nityānanda avadhūta sabāte āgala
caitanyera dāsya-preme ha-ilā pāgala
Synonyms: 
nityānanda avadhūta — the mendicant Lord Nityānanda; sabāte — among all; āgala — foremost; caitanyera dāsya-preme — in the emotional ecstatic love of being a servant of Śrī Caitanya Mahāprabhu; ha-ilā pāgala — became mad.
Translation: 
Śrī Nityānanda, the wandering mendicant, is the foremost of all the associates of Lord Caitanya. He became mad in the ecstasy of service to Lord Caitanya.