Ramayana
तेषामवरजस्तात सर्वेषां रघुनन्दन । मूढश्चाकृतविद्यश्च न शुश्रूषति पूर्वजान् ॥ 7-79-14 ॥
Among all of them, O dear son, O delight of the Raghus, the youngest was a fool, untrained in learning, and showed no obedience to his elders.
english translation