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darimi:3255Sahl b. Ḥammād > Hammām > Qatādah > ʿAmr b. Dīnār

[Machine] That his father had freed a slave for him during his illness, then he felt that he should revoke them and free others instead. He said, "So they disputed with me before Abdul Malik ibn Marwan." He (Abdul Malik) approved freeing the others and invalidated the freeing of the first ones.  

الدارمي:٣٢٥٥حَدَّثَنَا سَهْلُ بْنُ حَمَّادٍ حَدَّثَنَا هَمَّامٌ قَالَ حَدَّثَنِي قَتَادَةُ قَالَ حَدَّثَنِي عَمْرُو بْنُ دِينَارٍ

أَنَّ أَبَاهُ أَعْتَقَ رَقِيقًا لَهُ فِي مَرَضِهِ ثُمَّ بَدَا لَهُ أَنْ يَرُدَّهُمْ وَيُعْتِقَ غَيْرَهُمْ قَالَ فَخَاصَمُونِي إِلَى عَبْدِ الْمَلِكِ بْنِ مَرْوَانَ «فَأَجَازَ عِتْقَ الْآخِرِينَ وَأَبْطَلَ عِتْقَ الْأَوَّلِينَ»