Al-Sha'bi narrated that he heard Sayyiduna Jarir bin Abdullah (may Allah be pleased with him) say: "Any slave who runs away from his masters has committed disbelief until he returns to them." Mansur said: By Allah, he did narrate it from the Prophet (peace and blessings be upon him), but I do not want it to be narrated from me (in that way, as a saying of the Prophet).
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2319