As stated in Śrīmad-Bhāgavatam (SB 10.52.25):
- bandhūnām icchatāṁ dātuṁ kṛṣṇāya bhaginīṁ nṛpa
- tato nivārya kṛṣṇa-dviḍ rukmī caidyam amanyata
King Bhīṣmaka of Vidarbha wanted to offer Kṛṣṇa his daughter, Rukmiṇī, but Rukmī, the eldest of his five sons, objected. Therefore Bhīṣmaka withdrew his decision and decided to offer Rukmiṇī to the King of Cedi, Śiśupāla, who was a cousin of Kṛṣṇa’s. However, Rukmiṇī conceived of a trick: she sent a letter to Kṛṣṇa asking Him to kidnap her. Thus in order to please Rukmiṇī, who was His great devotee, Kṛṣṇa kidnapped her. There ensued a great fight between Kṛṣṇa and the opposing party, headed by Rukmiṇī’s brother Rukmī. Rukmī was defeated and, because of his harsh words against Kṛṣṇa, was about to be killed, but he was saved at the request of Rukmiṇī. However, Kṛṣṇa shaved off all of Rukmī’s hair with His sword. Śrī Balarāma did not like this, and so to please Rukmiṇī, Balarāma rebuked Kṛṣṇa.