Caitanya-caritāmṛta 7.148
vallabha-bhaṭṭera haya vātsalya-upāsana bāla-gopāla-mantre teṅho karena sevana
[vallabha-bhattera haya vaatsalya-upaasana baala-gopaala-mantre tenho karena sevana]
Blended reading (Sanskrit + English inline)
vallabha-bhaṭṭera haya vātsalya-upāsana bāla-gopāla-mantre teṅho karena sevana
Vallabha Bhaṭṭa was accustomed to worshiping the Lord as child Kṛṣṇa. Therefore he had been initiated into the Bāla-gopāla mantra and was thus worshiping the Lord.
My note
Source: vedabase.io