The Chapter on the Virtues of Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 31
وَقَالَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «إِذَا زَالَتِ اَلشَّمْسُ فُتِحَتْ أَبْوَابُ اَلسَّمَاءِ وَ أَبْوَابُ اَلْجِنَانِ وَ اُسْتُجِيبَ اَلدُّعَاءُ فَطُوبَى لِمَنْ رُفِعَ لَهُ عِنْدَ ذَلِكَ عَمَلٌ صَالِحٌ.
The Messenger of Allah صلى الله عليه وعلى آله وسلم said: "When the sun passes its zenith (noon), the gates of the heavens and the gates of Paradise are opened, and supplications are answered. Glad tidings to the one whose good deeds are raised at that time."
- Ṣaḥīḥ al-Faqīh