Mbh 1.169.2b

Employed in paying homage to the feet of Upayaja, always addressing in sweet words and offering him every object of human desire, Drupada, after worshipping that Brahmana, addressed him (one day), saying, ‘O Upayaja, O Brahmana, if thou, performest those sacrificial rites by (virtue of) which I may obtain a son who may slay Drona, I promise thee ten thousand kine, or whatever else may be agreeable to thee, O first of Brahmanas, truly am I ready to make gifts to thee.’ Thus addressed by the king, the Rishi replied, saying, ‘I cannot (perform such rites).’ But Drupada without accepting this reply as final, once more began to serve and pay homage unto that Brahmana. Then, after the expiration of a year, Upayaja, that first of Brahmanas, O monarch, addressing Drupada in sweet tone, said, ‘My elder brother (Yaja), one day, while wandering through the deep woods, took up a fruit that had fallen upon a spot the purity of which he cared not to enquire about. I was following him (at the time) and observed this unworthy act of his. Indeed, he entertains no scruples in accepting things impure. In accepting that (particular) fruit he saw not any impropriety of sinful nature: Indeed, he who observeth not purity (in one instance) is not very likely to observe it in the other instances. When he lived in the house of his preceptor, employed in studying the institutes, he always used to eat (impure) remnants of other people’s feasts. He always speaks approvingly of food and entertains no dislike for anything. Arguing from these, I believe that my brother covets earthy acquisitions. Therefore, O king, go unto him; he will perform spiritual offices for thee.’ Hearing these words of Upayaja, king Drupada, though entertaining a low opinion of Yaja, nevertheless went to his abode. Worshipping Yaja who was (still) worthy of homage, Drupada said unto him, ‘O master, perform thou spiritual offices for me and I will give thee eighty thousand kine!