SB 5.10.25

na vikriyā viśva-suhṛt-sakhasya
 sāmyena vītābhimates tavāpi
mahad-vimānāt sva-kṛtād dhi mādṛṅ
 naṅkṣyaty adūrād api śūlapāṇiḥ
Synonyms: 
na — not; vikriyā — material transformation; viśva-suhṛt — of the Supreme Personality of Godhead, who is a friend to everyone; sakhasya — of you, the friend; sāmyena — because of your mental equilibrium; vīta-abhimateḥ — who has completely forsaken the bodily concept of life; tava — your; api — indeed; mahat-vimānāt — of insulting a great devotee; sva-kṛtāt — from my own activity; hi — certainly; mādṛk — a person like me; naṅkṣyati — will be destroyed; adūrāt — very soon; api — certainly; śūla-pāṇiḥ — even though as powerful as Lord Śiva (Śūlapāṇi).
Translation: 
O my dear lord, you are the friend of the Supreme Personality of Godhead, who is the friend of all living entities. You are therefore equal to everyone, and you are free from the bodily conception. Although I have committed an offense by insulting you, I know that there is no loss or gain for you due to my insult. You are fixed in your determination, but I have committed an offense. Because of this, even though I may be as strong as Lord Śiva, I shall be vanquished without delay due to my offense at the lotus feet of a Vaiṣṇava.
Purport: 

Mahārāja Rahūgaṇa was very intelligent and conscious of the inauspicious effects arising from insulting a Vaiṣṇava. He was therefore very anxious to be excused by Jaḍa Bharata. Following in the footsteps of Mahārāja Rahūgaṇa, everyone should be very cautious not to commit an offense at the lotus feet of a Vaiṣṇava. Śrīla Vṛndāvana dāsa Ṭhākura in the Caitanya-bhāgavata (Madhya 13) says:

śūlapāṇi-sama yadi bhakta-nindā kare
 bhāgavata pramāṇa — tathāpi śīghra mare
hena vaiṣṇavere ninde sarvajña ha-i
 se janera adhaḥ-pāta sarva-śāstre ka-i

“Even if one is as strong as Lord Śiva, who carries a trident in his hand, one will nonetheless fall down from his spiritual position if he tries to insult a Vaiṣṇava. That is the verdict of all Vedic scriptures.” He also says this in Caitanya-bhāgavata (Madhya 22):

vaiṣṇavera nindā karibeka yāra gaṇa
 tāra rakṣā sāmarthya nāhika kona jana
śūlapāṇi-sama yadi vaiṣṇavere ninde
 tathāpiha nāśa yāya — kahe śāstra-vṛnde
ihā nā māniyā ye sujana nindā kare
 janme janme se pāpiṣṭha daiva-doṣe mare

“One who blasphemes a Vaiṣṇava cannot be protected by anyone. Even if a person is as strong as Lord Śiva, if he blasphemes a Vaiṣṇava he is sure to be destroyed. This is the verdict of all śāstras. If one does not care for the verdict of the śāstras and dares blaspheme a Vaiṣṇava, he suffers life after life because of this.”

Thus end the Bhaktivedanta purports of the Fifth Canto, Tenth Chapter, of the Śrīmad-Bhāgavatam, entitled “The Discussion Between Jaḍa Bharata and Mahārāja Rahūgaṇa.”