Sha'bi reported that the Messenger of Allah ﷺ observed prayer over a grave after the dead was buried and he recited four takbirs over him. Shaibani said: I said to Sha'bi: Who narrated it to you? He said: An authentic one, 'Abdullah b. 'Abbas. This is the word of a hasan hadith. In the narration of Ibn Numair (the words are): The Messenger of Allah ﷺ went to the grave which had been newly prepared and prayed over it, and they also prayed who were behind him and he recited four takbirs. I said to 'Amir: Who narrated it to you? He said: An authentic one who saw him, i e. Ibn 'Abbas.

حَدَّثَنَا حَسَنُ بْنُ الرَّبِيعِ، وَمُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، قَالاَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ، إِدْرِيسَ عَنِ الشَّيْبَانِيِّ، عَنِ الشَّعْبِيِّ، أَنَّ رَسُولَ اللَّهِ ﷺ صَلَّى عَلَى قَبْرٍ بَعْدَ مَا دُفِنَ فَكَبَّرَ عَلَيْهِ أَرْبَعًا . قَالَ الشَّيْبَانِيُّ فَقُلْتُ لِلشَّعْبِيِّ مَنْ حَدَّثَكَ بِهَذَا قَالَ الثِّقَةُ عَبْدُ اللَّهِ بْنُ عَبَّاسٍ . هَذَا لَفْظُ حَدِيثِ حَسَنٍ وَفِي رِوَايَةِ ابْنِ نُمَيْرٍ قَالَ انْتَهَى رَسُولُ اللَّهِ ﷺ إِلَى قَبْرٍ رَطْبٍ فَصَلَّى عَلَيْهِ وَصَفُّوا خَلْفَهُ وَكَبَّرَ أَرْبَعًا . قُلْتُ لِعَامِرٍ مَنْ حَدَّثَكَ قَالَ الثِّقَةُ مَنْ شَهِدَهُ ابْنُ عَبَّاسٍ .