Srimad Bhagavatam Canto 05, Chapter 09, Text 05

SB 5.9.5

sa capi tad u ha pitr-sannidhav evasadhricinam iva sma karoti chandamsy adhyapayisyan saha vyahrtibhih sapranava-siras tripadim savitrim graisma-vasantikan masan adhiyanam apy asamaveta-rupam grahayam asa.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Jada Bharata behaved before his father like a fool, despite his father’s adequately instructing him in Vedic knowledge. He behaved in that way so that his father would know that he was unfit for instruction and would abandon the attempt to instruct him further. He would behave in a completely opposite way. Although instructed to wash his hands after evacuating, he would wash them before. Nonetheless, his father wanted to give him Vedic instructions during the spring and summer. He tried to teach him the Gayatri mantra along with omkara and vyahrti, but after four months his father still was not successful in instructing him.
Srimad Bhagavatam Canto 05, Chapter 09, Text 04
Srimad Bhagavatam Canto 05, Chapter 09, Text 06