Sunan Abi Dawud 2951
Narrated Abdullah ibn Umar:
Zayd ibn Aslam said: Abdullah ibn Umar entered upon Mu'awiyah. He asked: (Tell me) your need, AbuAbdurRahman. He replied: Give (the spoils) to those who were set free, for I saw the first thing the Messenger of Allah (ﷺ) did when anything came to him was to give something to those who had been set free.
حَدَّثَنَا هَارُونُ بْنُ زَيْدِ بْنِ أَبِي الزَّرْقَاءِ، حَدَّثَنَا أَبِي، حَدَّثَنَا هِشَامُ بْنُ سَعْدٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، دَخَلَ عَلَى مُعَاوِيَةَ فَقَالَ حَاجَتُكَ يَا أَبَا عَبْدِ الرَّحْمَنِ فَقَالَ عَطَاءُ الْمُحَرَّرِينَ فَإِنِّي رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم أَوَّلَ مَا جَاءَهُ شَىْءٌ بَدَأَ بِالْمُحَرَّرِينَ ‏.‏