Narrated An-Nu'man bin Bashir:

My mother asked my father to present me a gift from his property;
and he gave it to me after some hesitation. My mother said that she would not be satisfied unless the Prophet was made a witness to it. I being a young boy, my father held me by the hand and took me to the Prophet . He said to the Prophet, "His mother, bint Rawaha, requested me to give this boy a gift." The Prophet ﷺ said, "Do you have other sons besides him?" He said, "Yes." The Prophet ﷺ said, "Do not make me a witness for injustice." Narrated Ash-Shabi that the Prophet ﷺ said, "I will not become a witness for injustice."

حَدَّثَنَا عَبْدَانُ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا أَبُو حَيَّانَ التَّيْمِيُّ، عَنِ الشَّعْبِيِّ، عَنِ النُّعْمَانِ بْنِ بَشِيرٍ ـ رضى الله عنهما ـ قَالَ سَأَلَتْ أُمِّي أَبِي بَعْضَ الْمَوْهِبَةِ لِي مِنْ مَالِهِ، ثُمَّ بَدَا لَهُ فَوَهَبَهَا لِي فَقَالَتْ لاَ أَرْضَى حَتَّى تُشْهِدَ النَّبِيَّ ﷺ. فَأَخَذَ بِيَدِي وَأَنَا غُلاَمٌ، فَأَتَى بِيَ النَّبِيَّ ﷺ فَقَالَ إِنَّ أُمَّهُ بِنْتَ رَوَاحَةَ سَأَلَتْنِي بَعْضَ الْمَوْهِبَةِ لِهَذَا، قَالَ " أَلَكَ وَلَدٌ سِوَاهُ ". قَالَ نَعَمْ. قَالَ فَأُرَاهُ قَالَ " لاَ تُشْهِدْنِي عَلَى جَوْرٍ ". وَقَالَ أَبُو حَرِيزٍ عَنِ الشَّعْبِيِّ " لاَ أَشْهَدُ عَلَى جَوْرٍ ".