From Sahih Muslim (Hadith 4329):
Salim b. 'Abdullah reported on the authority of his father that Allah's Apostle (ﷺ) said:He who emancipates a slave (shared) by him and another one, his full price may be justly assessed from his wealth, neither less nor more, and he (the slave) would be emancipated if he (the partner) would be solvent enough (to forgo the amount of his share)
Reference: Muslim 4329