Ramayana
उभौ सौमित्रिभरतौ रामपादावनुव्रतौ । कालं गतमपि स्नेहान्न जज्ञाते ऽतिधार्मिकौ ॥ 7-102-15 ॥
Both Lakshmana, son of Sumitra, and Bharata, supremely righteous and devoted to Rama's feet, did not, out of their love, even notice the time that passed.
english translation