Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 20

Sanskrit:

कृतन्यास: कृतन्यासां मदर्चां पाणिना मृजेत् ।कलशं प्रोक्षणीयं च यथावदुपसाधयेत् ॥ २० ॥

ITRANS:

kṛta-nyāsaḥ kṛta-nyāsāṁmad-arcāṁ pāṇināmṛjetkalaśaṁ prokṣaṇīyaṁ cayathāvad upasādhayet

Translation:

The devotee should sanctify the various parts of his body by touching them and chanting mantras. He should do the same for My Deity form, and then with his hands he should clean the Deity of old flowers and the remnants of previous offerings. He should properly prepare the sacred pot and the vessel containing water for sprinkling.

Purport:

Before beginning the process of worship mentioned here, one should offer obeisances to one’s spiritual master, the Deity and other worshipable personalities.