Musnad Ahmad 156
It was narrated from Ibn 'Abbas That 'Umar bin al-Khattab delivered a speech- on one ocassion, Hushaim said:
addressed us. - He praised and glorified Allah, then he mentioned stoning and said: Do not be diverted away from it, for it is one of the hadd punishments of Allah. The Messenger of Allah ﷺ stoned [adulterers], and we stoned [them] after he was gone. Were it not that some may say that 'Umar added something to the Book of Allah, may He be glorified and exalted, that is not part of it, I would have written it in some place in the Mushaf. 'Umar bin al-Khattab testified - and on one occasion Hushaim said: and 'Abdur-Rahman bin 'Awf and so and so and so and so[also testified] that the Messenger of Allah ﷺ stoned [adulterers] and we stoned [them] after he was gone. But there will come people after you who do not believe in stoning, or in the Dajjal, or intercession, or the torment of the grave, or that people will be brought out of Hell after they have been burned in it.
حَدَّثَنَا هُشَيْمٌ، أَنْبَأَنَا عَلِيُّ بْنُ زَيْدٍ، عَنْ يُوسُفَ بْنِ مِهْرَانَ، عَنِ ابْنِ عَبَّاسٍ، قَالَ خَطَبَ عُمَرُ بْنُ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ وَقَالَ هُشَيْمٌ مَرَّةً خَطَبَنَا فَحَمِدَ اللَّهَ تَعَالَى وَأَثْنَى عَلَيْهِ فَذَكَرَ الرَّجْمَ فَقَالَ لَا تُخْدَعُنَّ عَنْهُ فَإِنَّهُ حَدٌّ مِنْ حُدُودِ اللَّهِ تَعَالَى أَلَا إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَدْ رَجَمَ وَرَجَمْنَا بَعْدَهُ وَلَوْلَا أَنْ يَقُولَ قَائِلُونَ زَادَ عُمَرُ فِي كِتَابِ اللَّهِ مَا لَيْسَ مِنْهُ لَكَتَبْتُهُ فِي نَاحِيَةٍ مِنْ الْمُصْحَفِ شَهِدَ عُمَرُ بْنُ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ وَقَالَ هُشَيْمٌ مَرَّةً وَعَبْدُ الرَّحْمَنِ بْنُ عَوْفٍ وَفُلَانٌ وَفُلَانٌ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَدْ رَجَمَ وَرَجَمْنَا مِنْ بَعْدِهِ أَلَا وَإِنَّهُ سَيَكُونُ مِنْ بَعْدِكُمْ قَوْمٌ يُكَذِّبُونَ بِالرَّجْمِ وَبِالدَّجَّالِ وَبِالشَّفَاعَةِ وَبِعَذَابِ الْقَبْرِ وَبِقَوْمٍ يُخْرَجُونَ مِنْ النَّارِ بَعْدَمَا امْتَحَشُوا‏.‏