Infallibility

Verily Allah, Exalted be His remembrance, protects [from sin] whoever obeys Him, and whoever disobeys Him does not benefit from His protection.

رسولُ اللَّهِ صلى اللَّه عليه وآله :  إنَّ اللَّهَ عزَّ ذِكرُهُ يَعصِمُ مَن أطاعَهُ ، ولا يَعتَصِمُ بِهِ مَن عَصاهُ . الكافي : 8 / 82 / 39 .

 The Prophet (SAWA) said, ‘Verily Allah, Exalted be His remembrance, protects [from sin] whoever obeys Him, and whoever disobeys Him does not benefit from His protection.’ al-Kafi, v. 8, p. 82, no. 39