Srimad-Bhagavatam: Canto 8 - Chapter 1 - Verse 31
Sanskrit:
नमो द्विशीर्ष्णे त्रिपदे चतु:शृङ्गाय तन्तवे ।सप्तहस्ताय यज्ञाय त्रयीविद्यात्मने नम: ॥ ३१ ॥
ITRANS:
namo dvi-śīrṣṇe tri-padecatuḥ-śṛṅgāya tantavesapta-hastāya yajñāyatrayī-vidyātmane namaḥ
Translation:
I offer my respectful obeisances unto You, the Supreme Personality of Godhead, who have two heads [prāyaṇīya and udāyanīya], three legs [savana-traya], four horns [the four Vedas] and seven hands [the seven chandas, such as Gāyatrī]. I offer my obeisances unto You, whose heart and soul are the three Vedic rituals [karma-kāṇḍa, jñāna-kāṇḍa and upāsanā-kāṇḍa] and who expand these rituals in the form of sacrifice.