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.

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.