I was informed that he (the Holy Prophet) cursed the one who did that (and it was recorded) in his Sahifa (in a document).

أَنَّهُ سَمِعَ جَابِرَ بْنَ عَبْدِ اللَّهِ يَقُولُ كَتَبَ النَّبِيُّ ﷺ عَلَى كُلِّ بَطْنٍ عُقُولَهُ ثُمَّ كَتَبَ أَنَّهُ لاَ يَحِلُّ لِمُسْلِمٍ أَنْ يَتَوَالَى مَوْلَى رَجُلٍ مُسْلِمٍ بِغَيْرِ إِذْنِهِ ثُمَّ أُخْبِرْتُ أَنَّهُ لَعَنَ فِي صَحِيفَتِهِ مَنْ فَعَلَ ذَلِكَ

[AI] He heard Jabir ibn Abdullah saying that the Prophet ﷺ wrote on every contracted womb its intellect. Then he wrote that it is not permissible to pass a slave of a Muslim to someone else without his permission. He said, "Souls are to be respected."

أَنَّهُ سَمِعَ جَابِرَ بْنَ عَبْدِ اللهِ يَقُولُ كَتَبَ النَّبِيُّ ﷺ عَلَى كُلِّ بَطْنٍ عُقُولَهُ ثُمَّ إِنَّهُ كَتَبَ أَنَّهُ لَا يَحِلُّ أَنْ يُتَوَالَى مَوْلَى رَجُلٍ مُسْلِمٍ بِغَيْرِ إِذْنِهِ قَالَ رَوْحٌ يُتَوَلَّى

"The Messenger of Allah ruled that every clan should take part in paying the blood money, and it is not permissible for a freed slave to take a Muslim (other than the one who freed him) as his Mawla (Patron) without the permission (of his former master who set him free)" (Using translation from Nasāʾī 4829)

أَنَّهُ سَمِعَ جَابِرًا يَقُولُ «كَتَبَ رَسُولُ اللهِ ﷺ عَلَى كُلِّ بَطْنٍ عُقُولَهُ وَلَا يَحِلُّ لِمَوْلًى أَنْ يَتَوَلَّى مُسْلِمًا بِغَيْرِ إِذْنِهِ»

[AI] He heard Jabir ibn Abdullah saying that the Prophet ﷺ wrote on every belly that their minds should be guarded. Then he wrote that it is not permissible for a Muslim's servant to succeed him without his permission. Then I was informed that anyone who does that is cursed in a document.

أَنَّهُ سَمِعَ جَابِرَ بْنَ عَبْدِ اللهِ يَقُولُ كَتَبَ النَّبِيُّ ﷺ عَلَى كُلِّ بَطْنٍ عُقُولُهُ ثُمَّ كَتَبَ أَنَّهُ لَا يَحِلُّ أَنْ يَتَوَالَى مَوْلَى رَجُلٍ مُسْلِمٍ بِغَيْرِ إِذْنِهِ ثُمَّ أُخْبِرْتُ أَنَّهُ لَعَنَ فِي صَحِيفَةٍ مَنْ فَعَلَ ذَلِكَ