"Ask the Prophet to bear witness to what you have given to my son." So he came to the Prophet and told him about that, and the Prophet did not want to bear witness to it. (Using translation from Nasāʾī 3676)
لَهُ أُمَّهُ أَشْهِدِ النَّبِيَّ ﷺ عَلَى مَا نَحَلْتَ ابْنِي فَأَتَى النَّبِيَّ ﷺ فَذَكَرَ ذَلِكَ لَهُ فَكَرِهَ النَّبِيُّ ﷺ أَنْ يَشْهَدَ لَهُ