Narrated An-Nu'man bin Bashir:That his father gave a slave to a son of his. So he went to the Prophet (ﷺ) to have him witness it. He (ﷺ) said: 'Have you given a gift similar to this one to all of your sons?' He replied: 'No'. So he said: 'Then take him back

English translation · Jami' at-Tirmidhi