Do not be a witness for injustice, if asked for that

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 ".

Narrated Zahdam bin Mudrab:

I heard Imran bin Husain saying, "The Prophet ﷺ said, 'The best people are those living in my generation, then those coming after them, and then those coming after (the second generation)." Imran said "I do not know whether the Prophet mentioned two or three generations after your present generation. The Prophet added, 'There will be some people after you, who will be dishonest and will not be trustworthy and will give witness (evidences) without being asked to give witness, and will vow but will not fulfill their vows, and fatness will appear among them."

حَدَّثَنَا آدَمُ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا أَبُو جَمْرَةَ، قَالَ سَمِعْتُ زَهْدَمَ بْنَ مُضَرِّبٍ، قَالَ سَمِعْتُ عِمْرَانَ بْنَ حُصَيْنٍ ـ رضى الله عنهما ـ قَالَ قَالَ النَّبِيُّ ﷺ " خَيْرُكُمْ قَرْنِي، ثُمَّ الَّذِينَ يَلُونَهُمْ، ثُمَّ الَّذِينَ يَلُونَهُمْ ". قَالَ عِمْرَانُ لاَ أَدْرِي أَذَكَرَ النَّبِيُّ ﷺ بَعْدُ قَرْنَيْنِ أَوْ ثَلاَثَةً. قَالَ النَّبِيُّ ﷺ " إِنَّ بَعْدَكُمْ قَوْمًا يَخُونُونَ وَلاَ يُؤْتَمَنُونَ، وَيَشْهَدُونَ، وَلاَ يُسْتَشْهَدُونَ وَيَنْذِرُونَ وَلاَ يَفُونَ، وَيَظْهَرُ فِيهِمُ السِّمَنُ ".