Chandogya Upanishad 6.35

स हशाथ हैनमुपससाद तँ ह यत्किञ्च पप्रच्छ सर्वँह प्रतिपेदे ॥ ४ ॥

6.7.4 — sa hashatha hainamupasasada tan ha yatkincha paprachchha sarvanha pratipede || 4 ||

'Then wilt thou understand me.' Then Svetaketu ate, and afterwards approached his father. And whatever his father asked him, he knew it all by heart. Then his father said to him:

तब उसने भोजन किया और पिता के पास गया; पिता ने जो कुछ पूछा, उसने सब उत्तर दे दिए।