Śrī Caitanya Caritamrta · Text Ādi 17.15
তবে ত’ দ্বিভুজ কেবল বংশীবদন ।
শ্যাম–অঙ্গ পীতবস্ত্র ব্রজেন্দ্রনন্দন ॥ ১৫ ॥
tabe ta’ dvi-bhuja kevala vaṁśī-vadana
śyāma-aṅga pīta-vastra vrajendra-nandana
Finally the Lord showed Nityānanda Prabhu His two-armed form of Kṛṣṇa, the son of Mahārāja Nanda, simply playing on His flute, His bluish body dressed in yellow garments.
Read Śrīla Prabhupāda's purport on Vedabase.io