Matsyapurana 55.29

55.29

naitadviśīlāya na dāmbhikāya kutarkaduṣṭāya vinindakāya
prakāśanīyaṃ vratamindumauler yaścāpi nindāmadhikāṃ vidhatte //

Nothing should be said about this sacred observance to a blasphemer, to a person of evil conduct, to a hypocrite, or to a false reasoner, for they are liable to profane it. Doing so, would lead to sin.—29.