The Long Āgama Sūtra 5.25

5.25

「時，彼眾中自選一人，形體長大，顏貌端正，有威德者，而語之言：『汝今為我等作平等主，應護者護，應責者責，應遣者遣，當共集米，以相供給。』時，彼一人聞眾人言，即與為主，斷理諍訟，眾人即共集米供給。時，彼一人復以善言慰勞眾人，眾人聞已，皆大歡喜，皆共稱言：『善哉！大王！善哉！大王！』於是，世間便有王名，以正法治民，故名剎利，於是世間始有剎利名生。

“A man was then selected from that assembly who was physically large and appeared handsome. Being someone with authority, he said to them, ‘Now, you have made me the chief of the peace to safeguard what should be safeguarded, censure what should be censured, and banish what should be banished. We’ll collect rice together to provide for each other.’

“That man then listened to what people had to say, they provided for this chief to judge disputes, and they collected rice to provide for each other.

“That man again offered skillful words to console the people. When the people heard him, they rejoiced and together praised him: ‘Good, great king! Good, great king!’ This was when the title ‘king’ appeared in the world. In order to govern the populace with the correct teaching, he was called a warrior. This was when that the name ‘warrior’ first arose in the world.