Salvation of a sound heart.
‘Abdullāh ibn Salām (رحمه الله) said:
«إِنَّ عَمَلِي لَضَعِيفٌ، وَأَوْثَقُ مَا أَرْجُو بِهِ سَلَامَةَ الصَّدْرِ، وَتَرْكِي مَا لَا يَعْنِينِي»
“Indeed, my deeds are weak, and the most certain thing I hope in for my salvation is a sound heart and leaving what does not concern me.”
Jāmiʿ al-ʿUlūm wa’l-Ḥikam (1/294)