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suyuti:2-1259bal-Ḥasan
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السيوطي:٢-١٢٥٩b

"عَنِ الْحَسَنِ أَنَّ رَجُلا بَاعَ جَارِيَةً لأَبِيهِ، وَأَبُوهُ غَائِبٌ، فَلَمَّا قَدِمَ أَبُوهُ أَبَى أَنْ يُجِيز بَيْعَه وَقَدْ وَلدتْ مِنَ الْمُشْتَرِى، فَاخْتَصَمُوا إِلَى عُمَرَ بْنِ الْخَطَّابِ، فَقَضَى

لِلرَّجُلِ بِجَارِيَتِهِ، وَأَمَرَ الْمُشْتَرِى أَنْ يَأخُذَ بَيْعَهُ بِالْخَلاصِ، فَلَزِمَهُ، فَقَالَ أَبُو الْبَائِعِ: مُرْهُ فَلْيُخَلِّ عَنِ ابْنِى، فَقَالَ لَهُ عُمَرُ: وَأَنْتَ فَخَلِّ عَنْ أبِيهِ".  

[ص] سعيد بن منصور [ق] البيهقى في السنن

See similar narrations below:

Collected by Bayhaqī
bayhaqi:11547Abū Ḥāzim al-ʿAbdawī al-Ḥāfiẓ > Abū al-Faḍl b. Khamīrawayh > Aḥmad b. Najdah > Saʿīd b. Manṣūr > Hushaym > Ḥumayd al-Ṭawīl > al-Ḥasan > a man

[Machine] A man sold a slave girl belonging to his father while his father was absent. When his father returned, he refused to approve the sale as the buyer had already given birth to a child from her. They disputed the matter to Umar ibn al-Khattab, who ruled in favor of the man regarding his slave girl and ordered the buyer to take his purchase in full settlement. The father of the seller requested Umar to show mercy and spare his son. Umar then said to him, "And you, spare his son."  

البيهقي:١١٥٤٧أَخْبَرَنَا أَبُو حَازِمٍ الْعَبْدَوِيُّ الْحَافِظُ أنبأ أَبُو الْفَضْلِ بْنُ خَمِيرَوَيْهِ ثنا أَحْمَدُ بْنُ نَجْدَةَ ثنا سَعِيدُ بْنُ مَنْصُورٍ ثنا هُشَيْمٌ ثنا حُمَيْدٌ الطَّوِيلُ عَنِ الْحَسَنِ

أَنَّ رَجُلًا بَاعَ جَارِيَةً لِأَبِيهِ وَأَبُوهُ غَائِبٌ فَلَمَّا قَدِمَ أَبَى أَبُوهُ أَنْ يُجِيزَ بَيْعَهُ وَقَدْ وَلَدَتْ مِنَ الْمُشْتَرِي فَاخْتَصَمُوا إِلَى عُمَرَ بْنِ الْخَطَّابِ فَقَضَى لِلرَّجُلِ بِجَارِيَتِهِ وَأَمَرَ الْمُشْتَرِي أَنْ يَأْخُذَ بَيِّعَهُ بِالْخَلَاصِ فَلَزِمَهُ فَقَالَ أَبُو الْبَائِعِ مُرْهُ فَلْيُخَلِّ عَنِ ابْنِي فَقَالَ لَهُ عُمَرُ ؓ وَأَنْتَ فَخَلِّ عَنِ ابْنِهِ