Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 30
Sanskrit:
नैतत्त्वया दाम्भिकाय नास्तिकाय शठाय च ।अशुश्रूषोरभक्ताय दुर्विनीताय दीयताम् ॥ ३० ॥
ITRANS:
naitat tvayā dāmbhikāyanāstikāya śaṭhāya caaśuśrūṣor abhaktāyadurvinītāya dīyatām
Translation:
You should not share this instruction with anyone who is hypocritical, atheistic or dishonest, or with anyone who will not listen faithfully, who is not a devotee, or who is simply not humble.