In case the slave is owned by two persons, and one of them emancipates him, he will guarantee (his full freedom).
Sahih Muslim Book 27, Hadith 78
← Previous Hadith He who gives up his share in a slave, the remaining (share) will be paid out of his riches if his riches are enough to meet the price of the slave.

Sahih Muslim Book 27, Hadith 77 Next Hadith → " He who emancipates a portion in a slave, he should (secure full) freedom for him from his property."

Sahih Muslim Book 27, Hadith 79