Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bayhaqi:21694Abū Bakr > Hushaym > Yūnus

[Machine] For one of them to correspond with the other, he must have the permission of his partner, and if he does so against his will, he has sworn an oath.  

البيهقي:٢١٦٩٤قَالَ وَحَدَّثَنَا أَبُو بَكْرٍ ثنا هُشَيْمٌ عَنْ يُونُسَ عَنِ الْحَسَنِ فِي عَبْدٍ بَيْنَ رَجُلَيْنِ قَالَ كَانَ يَكْرَهُ

أَنْ يُكَاتِبَ أَحَدُهُمَا إِلَّا بِإِذْنِ شَرِيكِهِ فَإِنْ فَعَلَ قَاسَمَهُ