Sahih Muslim, 4333

Abu Huraira reported Allah's Apostle (ﷺ) as saying:He who emancipates his portion in a slave, full emancipation may be secured for him out of his property (if he has money) if he has enough property to meet (the required expenses), but if he has not enough property, the slave should be put to extra labour (in order to earn money for buying his freedom), but he should not be overburdened

Rapporté par Abu Huraira رضي الله عنه : Le Messager d’Allah ﷺ a dit : « Celui qui affranchit sa part dans un esclave, la liberté complète peut être assurée pour lui à partir de ses biens (s’il en a les moyens). Mais s’il n’a pas assez de biens, l’esclave devra travailler davantage pour gagner sa liberté, sans qu’on lui impose une charge excessive. »