"I saw the Messenger of Allah prostrating for (Surat) Sad." Ibn Abbas said: "It is not one of the resolute prostrations."  

رَأَيْتُ رَسُولَ اللَّهِ ﷺ يَسْجُدُ فِي ص قَالَ ابْنُ عَبَّاسٍ وَلَيْسَتْ مِنْ عَزَائِمِ السُّجُودِ