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Śrī-Caitanya-caritāmṛta
PURPORT
It is very beneficial to chant the names  śrī-kṛṣṇa-caitanya prabhu nityānanda  before chanting the Hare Kṛṣṇa  mahā-mantra  because by chanting these two holy names  śrī-kṛṣṇa-caitanya prabhu nityānanda  one immediately becomes ecstatic, and if he then chants the Hare Kṛṣṇa  mahā-mantra  he becomes free of offenses.
There are ten offenses to avoid in chanting the Hare Kṛṣṇa  mahā-mantra . The first offense is to blaspheme great personalities who are engaged in distributing the holy name of the Lord. It is said in the  śāstra  (Cc.  Antya . 7.11),  kṛṣṇa-śakti vinā nahe tāra pravartana : one cannot distribute the holy names of the Hare Kṛṣṇa  mahā-mantra  unless he is empowered by the Supreme Personality of Godhead. Therefore one should not criticize or blaspheme a devotee who is thus engaged.
Śrī Padma Purāṇa  states:
satāṁ nindā nāmnaḥ paramam aparādhaṁ vitanute yataḥ khyātiṁ yātaṁ katham u sahate tad-vigarhām
To blaspheme the great saintly persons who are engaged in preaching the glories of the Hare Kṛṣṇa  mahā-mantra  is the worst offense at the lotus feet of the holy name. One should not criticize a preacher of the glories of the Hare Kṛṣṇa  mahā-mantra . If one does so, he is an offender. The Nāma-prabhu, who is identical with Kṛṣṇa, will never tolerate such blasphemous activities, even from one who passes as a great devotee.
The second  nāmāparādha  is described as follows:
śivasya śrī-viṣṇor ya iha guṇa-nāmādi-sakalaṁ dhiyā bhinnaṁ paśyet sa khalu hari-nāmāhita-karaḥ
In this material world, the holy name of Viṣṇu is all-auspicious. Viṣṇu's name, form, qualities and pastimes are all transcendental absolute knowledge. Therefore, if one tries to separate the Absolute Personality of Godhead from His holy name or His transcendental form, qualities and pastimes, thinking them to be material, that is offensive. Similarly, to think the names of demigods such as Lord Śiva to be as good as the name of Lord Viṣṇu—or, in other words, to think Lord Śiva and the other demigods to be other forms of God and therefore equal to Viṣṇu—is also blasphemous. This is the second offense at the lotus feet of the Lord.
The third offense at the lotus feet of the holy name, which is called  guror avajñā , is to consider the spiritual master to be material and therefore envy his exalted position. The fourth offense ( śruti-śāstra-nindanam ) is to blaspheme Vedic literatures such as the four  Vedas  and the  Purāṇas . The fifth offense ( tathārtha-vādaḥ ) is to consider the glories of the holy name to be exaggerations. Similarly, the sixth offense ( hari-nāmni kalpanam ) is to consider the holy name of the Lord to be imaginary.
The seventh offense is described as follows:
nāmno balād yasya hi pāpa-buddhir na vidyate tasya yamair hi śuddhiḥ