Vaishnava Dharmashastra 65.1

65.1

athātaḥ susnātaḥ suprakṣālitapāṇipādaḥ svācānto devatārcāyāṃ sthale vā bhagavantam anādinidhanaṃ vāsudevam abhyarcayet ||

Now then, after having duly bathed, and duly washed his hands and feet, and duly sipped water, he must worship Bhagavat Vâsudeva (Vishnu), who is without beginning and end, before an idol or on the sacrificial ground.