Mahabharata — Anushasana Parva, Shloka 26
Adhyāya 142: Cyavana, the Devas’ Arrogance, and Vāyu’s Counsel on Protecting Brāhmaṇas
कौत्साय दत्त्वा कन्यां तु हंसीं नाम यशस्विनीम् | गतो$क्षयानतो लोकानू् राजर्षिश्ष भगीरथ:,राजर्षि भगीरथ अपनी यशस्विनी कन्या हंसीका कौत्स ऋषिको दान करके अक्षय लोकोंमें गये हैं
Kautsāya dattvā kanyāṃ tu Haṃsīṃ nāma yaśasvinīm | gato 'kṣayānato lokān rājarṣiḥ Bhāgīrathaḥ ||
毗湿摩说道：王仙婆伽罗多依正法将其声名卓著之女“汉西”(Haṃsī)嫁与圣者考特萨(Kautsa)，遂得至不坏不灭之诸界。
भीष्म उवाच
Educational Q&A
The verse teaches that dharmic giving—here, the proper giving of a daughter in marriage to a worthy sage—produces lasting merit, culminating in attainment of imperishable heavenly realms.
Bhīṣma cites the example of the royal sage Bhāgīratha, who gave his renowned daughter Haṃsī to the sage Kautsa, and as a result is said to have gone to the akṣaya (imperishable) worlds.