Anushasana Parva 19.34

Then king Vaishravana, approaching the innocent Ashtavakra, duly enquired about his welfare. The usual polite enquiries being over, the Lord of Riches then addressed the twice twiceborn Rishi, saying You are welcome. Do tell me what do you want from me. Inform me of it, I shall O twiceborn one, do whatever you may order me to accomplish.