SB 1.11 - Kṛṣṇa's visits to Vṛndāvana
The citizens said that when the Lord went away to Hastināpura (kurūn), Mathurā (madhūn) (or Vṛndāvana) to meet His friends and relatives, every moment of His absence seemed like a million years. Their eyes become useless as if bereft of sun. Viśvanātha explains that madhūn means Vraja, not Mathurā because at that time none of Kṛṣṇa’s friends resided there at Mathurā. This is confirmed in SB 10.50.57 where it is said that the Lord brought all (sarva-janaṁ) inhabitants of Mathurā to Dvārakā. And His coming back to Vraja was His promise in SB 10.39.35 and 10.45.23 that He would return. This is also clearly mentioned in Padma Purāṇa and other Purāṇas.