Vaishnava Samhita. Raskhan Charitam. Vol III Book VII Chp 13 Shlokas 27 - 28

विज्ञाय म्लेच्छमेनं तु ते सर्वे वौष्णवास्तदा |

श्रीनाथस्यालयं गन्तुं न ददुर्मार्गमस्य च ||

विरहव्याकुलात्मा च कृष्णकीर्तनतत्परः |

वृक्षमूलेsवसन्नित्यं विनिद्रो वायुभोजनः ||

Those vaishnavas did not allow him to enter the temple of Lord Shrinatha as they learnt that he was a muslim. Yet, Raskhan stayed under a tree engaged in Krishna kirthan. As he was thoroughly distressed, due to his separation from Shri Krishna, he gave up even food and sleep.