The Mahabharata/Book 1: Adi Parva…
“ Some time after, Pandu again requested Kunti on behalf of Madri. Addressed, O king, by her lord in private, Kunti replied, 'Having given her the formula of invocation only once, she hath, O king, managed to obtain two sons. Have I not been thus deceived by her, I fear, O king, that she will soon surpass me in the number of her children. This, indeed, is the way of all wicked women. Fool that I was, I did not know that by invoking the twin gods I could obtain at one birth twin children. I beseech thee, O king, do not command me any further. ”
