Srimad Bhagavatam Canto 04, Chapter 21, Text 45

SB 4.21.45

maitreya uvaca
iti bruvanam nrpatim
 pitr-deva-dvijatayah
tustuvur hrsta-manasah
 sadhu-vadena sadhavah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
 
The great sage Maitreya said: After hearing King Prthu speak so nicely, all the demigods, the denizens of Pitrloka, the brahmanas and the saintly persons present at the meeting congratulated him by expressing their good will.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
 
When a person speaks very nicely at a meeting, he is congratulated by the audience, who express their good will with the words sadhu, sadhu. This is called sadhu-vada. All the saintly persons, Pitas (denizens of Pitrloka) and demigods who were present at the meeting and heard Prthu Maharaja expressed their good will with the words sadhu, sadhu. They all accepted the good mission of Prthu Maharaja, and they were fully satisfied.

 

Srimad Bhagavatam Canto 04, Chapter 21, Text 41
Srimad Bhagavatam Canto 04, Chapter 21, Text 43