Durood Sharif
The famous scholar Ibn al-Qayyim wrote an entire volume, Jalal al-Afham fi Salat 'ala Khayr al-Anam , detailing nearly forty distinct wisdom benefits of Durood. He concluded that sending blessings upon the Prophet is a more effective remedy for hardening of the heart than any other form of remembrance.
When a believer recites Durood: