Musnad Ahmad 172
It was narrated that Malik bin Aws said:
I heard 'Umar say to ‘Abdur­-Rahman bin ‘Awf,

Talhah, az-­Zubair and Sa'd: We adjure you by Allah, by whom heaven and earth are sustained, 

did you know that the Messenger of Allah (ﷺ) said: “Our (Prophets’) property is not to be inherited 

and whatever we leave behind is charity.` They said: By Allah, yes,
حَدَّثَنَا سُفْيَانُ، عَنْ عَمْرٍو، عَنِ الزُّهْرِيِّ، عَنْ مَالِكِ بْنِ أَوْسٍ، قَالَ سَمِعْتُ عُمَرَ، رَضِيَ اللَّهُ عَنْهُ يَقُولُ لِعَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ وَطَلْحَةَ وَالزُّبَيْرِ وَسَعْدٍ نَشَدْتُكُمْ بِاللَّهِ الَّذِي تَقُومُ السَّمَاءُ وَالْأَرْضُ بِهِ أَعَلِمْتُمْ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِنَّا لَا نُورَثُ مَا تَرَكْنَا صَدَقَةٌ قَالُوا اللَّهُمَّ نَعَمْ‏.‏