Srimad Bhagavatam Canto 11, Chapter 29, Text 30

SB 11.29.30

naitat tvaya dambhikaya
 nastikaya sathaya ca
asusrusor abhaktaya
 durvinitaya diyatam
 
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.
Srimad Bhagavatam Canto 11, Chapter 29, Text 29
Srimad Bhagavatam Canto 11, Chapter 29, Text 31