CC Madhya 7.34

tabe nityānanda kahe, — ye ājñā tomāra
duḥkha sukha ye ha-uk kartavya āmāra
Word for word: 
tabe — thereupon; nityānanda — Lord Nityānanda Prabhu; kahe — says; ye ājñā — whatever order; tomāra — Your; duḥkha sukha — distress or happiness; ye — whatever; ha-uk — let there be; kartavya — the duty; āmāra — My.
Translation: 
Thereupon Lord Nityānanda said, “Whatever You order is My duty, regardless of whether it results in happiness or unhappiness.