Since that time, the city of Mathurā had been the capital of all the kings of the Yadu dynasty. The city and district of Mathurā are very intimately connected with Kṛṣṇa, for Lord Kṛṣṇa lives there eternally.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
राजधानी ततः साभूत्सर्वयादवभूभुजाम् । मथुरा भगवान् यत्र नित्यं सन्निहितो हरिः
rājadhānī tataḥ sābhūtsarvayādavabhūbhujām | mathurā bhagavān yatra nityaṃ sannihito hariḥ
SB 10.1.28