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SB 4.15.21
stavakams tan abhipretya
prthur vainyah pratapavan
megha-nirhradaya vaca
prahasann idam abravit
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Thus when the greatly powerful King Prthu, the son of Vena, saw the professionals before him, to congratulate them he smiled, and with the gravity of the vibrating sounds of clouds he spoke as follows.