Sahih Al Bukhari (642)

عن النعمان بن بشير رضي الله عنهما قال "سألت أمي أبي بعض الموهبة لي من ماله ثم بدا له فوهبها لي فقالت لا أرضى حتى تشهد النبي (صلى الله عليه وسلم) فأخذ بيدي وأنا غلام فأتى بي النبي (صلى الله عليه وسلم) فقال إن أمه بنت رواحة سألتني بعض الموهبة لهذا قال ألك ولد سواه قال نعم قال فأراه قال لا تشهدني على جور" وقال أبو حريز عن الشعبي لا أشهد على جور.

An-Nu`man ibn Bashir narrated: 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 (peace be upon him) was made a witness to it. I being a young boy, my father held me by the hand and took me to the Prophet (peace be upon him). He said to the Prophet (peace be upon him): "His mother, bint Rawaha, requested me to give this boy a gift." The Prophet (peace be upon him) said: "Do you have other sons besides him?" He said: "Yes." The Prophet (peace be upon him) said: "Do not make me a witness for injustice." Narrated Ash-Sha‘bi that the Prophet (peace be upon him) said: "I will not become a witness for injustice."