The Prophet (peace and blessings be upon him) said:
"Any slave who runs away from his masters has committed disbelief (ingratitude) until he returns to them."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 2731
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[م] عن جرير. مختصر مسلم ٥٧، الروض النضير ٢٦٩.