Vaishnava Samhita. Ghanananda Charitam. Vol III Book VI Chp 21 Shlokas 29 - 32

बहुना किं वैष्णवेषु पक्षपातेन माधवः |
आविर्भवति गोविन्दो दुष्टान् शिक्षयितुं मुहुः ||
प्रायश्चित्तानि सन्त्येव दुष्कृतानामशेषतः |
किन्तु भक्तापराधस्य प्रायश्चित्तं न विद्यते ||
सहते भगवान् विष्णुरपराधान् सहस्त्रशः |
आत्मने कल्पितान् भक्तेभ्यःकलितान् खलैः |
भक्तानां रक्षणायैव धियते चक्रमुत्तमम् || 

In fact Shri Madhava is very specially fond of the vaishnavas and hence He incarnates again and again to punish the wicked ones. All sins can be easily expiated. But there is no way of expiation for the greatest sin of abusing the bhagavatas. Bhagavan, Shri Vishnu tolerates thousands of sins committed against Him by His bhaktas, with or without their knowledge. But he never tolerates vilification of the bhaktas by the wicked ones. For Shri Bhagavan holds his weapon of the holy disc in His hand only to protect His bhaktas.

Thus ends Chapter Twenty Two entitled 'Ghanananda Charitam' of Book VI of Shri Vaishnava Samhita composed by Shri Shri Krishna Premi Swamigal.