SB 9.1.21
evam vyavasito rajan
bhagavan sa maha-yasah
astausid adi-purusam
ilayah pumstva-kamyaya
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Sukadeva Gosvami said: O King Pariksit, after the most famous and powerful Vasistha made this decision, he offered prayers to the Supreme Person, Visnu, to transform Ila into a male.