Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 32

Sanskrit:

शङ्खचूडं निहत्यैवं मणिमादाय भास्वरम् ।अग्रजायाददात्प्रीत्या पश्यन्तीनां च योषिताम् ॥ ३२ ॥

ITRANS:

śaṅkhacūḍaṁ nihatyaivaṁmaṇim ādāya bhāsvaramagrajāyādadāt prītyāpaśyantīnāṁ ca yoṣitām

Translation:

Having thus killed the demon Śaṅkhacūḍa and taken away his shining jewel, Lord Kṛṣṇa gave it to His elder brother with great satisfaction as the gopīs watched.

Purport:

Various gopīs perhaps thought that Govinda would give one of them the valuable jewel. To prevent rivalry among them, Śrī Kṛṣṇa happily gave the jewel to His older brother, Balarāma.