|Ādi-līlā||Chapter 4: The Confidential Reasons for the Appearance of Śrī Caitanya Mahāprabhu|
Bhaktivedanta VedaBase: Śrī Caitanya Caritāmṛta Ādi 4.177
kṛṣṇera pratijñā eka āche pūrva haite
ye yaiche bhaje, kṛṣṇa tāre bhaje taiche
kṛṣṇera — of Lord Kṛṣṇa; pratijñā — promise; eka — one; āche — there is; pūrva haite — from before; ye — whoever; yaiche — just as; bhaje — he worships; kṛṣṇa — Lord Kṛṣṇa; tāre — to him; bhaje — reciprocates; taiche — just so.
Lord Kṛṣṇa has a promise from before to reciprocate with His devotees according to the way they worship Him.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness