Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 48
Sanskrit:
तावाज्ञापयतं भृत्यं किमहं करवाणि वाम् ।पुंसोऽत्यनुग्रहो ह्येष भवद्भिर्यन्नियुज्यते ॥ ४८ ॥
ITRANS:
tāv ajñāpayataṁ bhṛtyaṁkim ahaṁ karavāṇi vāmpuṁso ’ty-anugraho hy eṣabhavadbhir yan niyujyate
Translation:
Please order me, Your servant, to do whatever You wish. To be engaged by You in some service is certainly a great blessing for anyone.