SB 11.30.46

gaccha dvāravatīṁ sūta
 jñātīnāṁ nidhanaṁ mithaḥ
saṅkarṣaṇasya niryāṇaṁ
 bandhubhyo brūhi mad-daśām
gaccha — just go; dvāravatīm — to Dvārakā; sūta — O chariot driver; jñātīnām — of their close relatives; nidhanam — the destruction; mithaḥ — mutual; saṅkarṣaṇasya — of Lord Balarāma; niryāṇam — the passing away; bandhubhyaḥ — to Our family members; brūhi — speak; mat-daśām — My condition.
O driver, go to Dvārakā and tell Our family members how their loved ones destroyed one another. Also tell them of the disappearance of Lord Saṅkarṣaṇa and of My present condition.

Lord Kṛṣṇa sent His chariot driverless back to Vaikuṇṭha, along with the horses and weapons, because the chariot driver, Dāruka, had some final service to do on earth.