Harivamsha 70.8

70.8

athāha kṛṣṇam akrūro yamunātīram āśritaḥ
syandanaṃ tāta rakṣasva yatnaṃ ca kuru vājiṣu //

Then Akrūra, resting by the bank of the Yamunā, said to Kṛṣṇa,
"Guard the chariot, my dear boy, and attend to the horses.