The word rajarsi refers to a king who behaves like a rsi, or sage. Such a king is also called naradeva because he is considered a representative of the Supreme Lord

Expressions researched:
"The word rājarṣi refers to a king who behaves like a ṛṣi, or sage. Such a king is also called naradeva because he is considered a representative of the Supreme Lord"

Srimad-Bhagavatam

SB Canto 9

The word rājarṣi refers to a king who behaves like a ṛṣi, or sage. Such a king is also called naradeva because he is considered a representative of the Supreme Lord. Because his duty is to rule the kingdom to maintain brahminical culture, he never desires to kill a brāhmaṇa. Generally, a brāhmaṇa, woman, child, old man or cow is never regarded as punishable.

SB 9.9.30, Translation and Purport

My lord, you are completely aware of the religious principles. As a son never deserves to be killed by his father, here is a brāhmaṇa who should be protected by the king, and never killed. How does he deserve to be killed by a rājarṣi like you?

The word rājarṣi refers to a king who behaves like a ṛṣi, or sage. Such a king is also called naradeva because he is considered a representative of the Supreme Lord. Because his duty is to rule the kingdom to maintain brahminical culture, he never desires to kill a brāhmaṇa. Generally, a brāhmaṇa, woman, child, old man or cow is never regarded as punishable. Thus the wife of the brāhmaṇa requested the King to refrain from this sinful act.