CC Ādi 5.175

dui bhāi eka-tanu — samāna-prakāśa
nityānanda nā māna, tomāra habe sarva-nāśa
Word for word: 
dui bhāi — two brothers; eka-tanu — one body; samāna-prakāśa — equal manifestation; nityānanda — Lord Nityānanda; nā māne — you do not believe; tomāra — your; habe — that will be; sarva-nāśa — downfall.
Translation: 
“These two brothers,” I told him, “are like one body; They are identical manifestations. If you do not believe in Lord Nityānanda, you will fall down.