Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 45

Sanskrit:

चैद्यदेहोत्थितं ज्योतिर्वासुदेवमुपाविशत् ।पश्यतां सर्वभूतानामुल्केव भुवि खाच्च्युता ॥ ४५ ॥

ITRANS:

caidya-dehotthitaṁ jyotirvāsudevam upāviśatpaśyatāṁ sarva-bhūtānāmulkeva bhuvi khāc cyutā

Translation:

An effulgent light rose from Śiśupāla’s body and, as everyone watched, entered Lord Kṛṣṇa just like a meteor falling from the sky to the earth.

Purport:

In this connection, the ācāryas remind us that Śiśupāla is actually one of the Lord’s eternal associates playing the part of a belligerent demon. Thus to most observers it appeared that Śiśupāla achieved the impersonal liberation of merging into Lord Kṛṣṇa’s bodily effulgence. In fact, after being liberated from his mortal frame, Śiśupāla returned to the side of his master, the Supreme Lord of the spiritual world. The following verse further explains this.