Imam Ridha/Reza (AS) said:

Know that the best of Wajib deeds after knowing God is five times daily Wajib Salaats. People are required to recite Surahs Al-Fatihah and Ikhlas when performing Salaat/Salaah in order that the Quran is not isolated or damaged. Imam Ridha (AS) added: Take care of the times of Salaat (Perform Salaat on time); because the human being is not immune from incidents which (may) prevent (them from) performing Salaat on time. In a commentary of Ayah 5 of Surah Al-Ma’un, Imam Ridha (AS) explained: Woe betides anyone who neglects the times of Wajib Salaat.

Source: en.shafaqna.com