عَنْ عَائِشَةَ رَضِيَ اَللَّهُ عَنْهَا قَالَتْ: { أَوَّلُ مَا فُرِضَتْ اَلصَّلَاةُ رَكْعَتَيْنِ, فَأُقِرَّتْ صَلَاةُ اَلسَّفَرِ وَأُتِمَّتْ صَلَاةُ اَلْحَضَرِ } مُتَّفَقٌ عَلَيْه ِ 1‏.‏

‏1 ‏- صحيح.‏ رواه البخاري (1090)‏، ومسلم (685)‏.‏

Translation
Narrated Ibn 'Abbas (RA)

A prostration while reciting Surat Sad (Surah 38) is not one of the 'Azaa'im (those which are alwaysrequired), but I have seen Allah's Messenger (ﷺ) prostrating while reciting it.[Reported by al-Bukhari].