The Compendium of Caraka 3.8.5

3.8.5

tamupasṛtyārirādhayiṣurupacaredagnivacca devavacca rājavacca pitṛvacca bhartṛvaccāpramattaḥ/

Approaching him with a desire to please him, he should serve him unremittingly like fire, like a deity, like a king, like a father, and like a master.