SB 10.37.9

devarṣir upasaṅgamya
 bhāgavata-pravaro nṛpa
kṛṣṇam akliṣṭa-karmāṇaṁ
 rahasy etad abhāṣata
deva-ṛṣiḥ — the sage among the demigods (Nārada Muni); upasaṅgamya — approaching; bhāgavata — of devotees of the Lord; pravaraḥ — the most exalted; nṛpa — O King (Parīkṣit); kṛṣṇam — Lord Kṛṣṇa; akliṣṭa — without trouble; karmāṇam — whose activities; rahasi — in privacy; etat — this; abhāṣata — said.
My dear King, thereafter Lord Kṛṣṇa was approached in a solitary place by the great sage among the demigods, Nārada Muni. That most exalted devotee spoke as follows to the Lord, who effortlessly performs His pastimes.

After speaking with Kaṁsa, Nārada went to see Lord Kṛṣṇa. The Lord’s Vṛndāvana pastimes were nearly completed, and Nārada wanted to see those He would enact in Mathurā.