"The contractual obligation regarding a slave lasts for three days." (1)

قَالَ رَسُولُ اللَّهِ ﷺ عُهْدَةُ الرَّقِيقِ ثَلاَثَةُ أَيَّامٍ

"There is no contractual obligation after four (days)."

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ عُهْدَةَ بَعْدَ أَرْبَعٍ