It is narrated from Sayyiduna Wathilah bin al-Asqa' (may Allah be pleased with him) that some people of Banu Sulaym came to the Messenger of Allah (peace and blessings be upon him) and said: "A companion of ours has made the Fire obligatory upon himself." He (peace and blessings be upon him) said: "Let a slave be freed on his behalf; Allah will free, for every limb of it, a limb of his from the Fire."
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18441