SB 9.20.20
yada na jagrhe raja
bharya-putrav aninditau
srnvatam sarva-bhutanam
khe vag ahasaririni
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When the King refused to accept his wife and son, who were both irreproachable, an unembodied voice spoke from the sky as an omen and was heard by everyone present.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Maharaja Dusmanta knew that Sakuntala and the boy were his own wife and son, but because they came from outside and were unknown to the citizens, he at first declined to accept them. Sakuntala, however, was so chaste that an omen from the sky declared the truth so that others could hear. When everyone heard from the omen that Sakuntala and her child were truly the King’s wife and son, the King gladly accepted them.