SB 1.19.11

anye ca devarṣi-brahmarṣi-varyā
 rājarṣi-varyā aruṇādayaś ca
nānārṣeya-pravarān sametān
 abhyarcya rājā śirasā vavande
Synonyms: 
anye — many others; ca — also; devarṣi — saintly demigods; brahmarṣi — saintly brāhmaṇas; varyāḥ — topmost; rājarṣi-varyāḥ — topmost saintly kings; aruṇa-ādayaḥ — a special rank of rājarṣis; ca — and; nānā — many others; ārṣeya-pravarān — chief amongst the dynasties of the sages; sametān — assembled together; abhyarcya — by worshiping; rājā — the Emperor; śirasā — bowed his head to the ground; vavande — welcomed.
Translation: 
There were also many other saintly demigods, kings and special royal orders called aruṇādayas [a special rank of rājarṣis] from different dynasties of sages. When they all assembled together to meet the Emperor [Parīkṣit], he received them properly and bowed his head to the ground.
Purport: 

The system of bowing the head to the ground to show respect to superiors is an excellent etiquette which obliges the honored guest deep into the heart. Even the first-grade offender is excused simply by this process, and Mahārāja Parīkṣit, although honored by all the ṛṣis and kings, welcomed all the big men in that humble etiquette in order to be excused from any offenses. Generally at the last stage of one’s life this humble method is adopted by every sensible man in order to be excused before departure. In this way Mahārāja Parīkṣit implored everyone’s good will for going back home, back to Godhead.