Riyad as-Salihin, Book 18, Hadith 1769 (In-Book)

Jarir bin Abdullah (May Allah be pleased with him) said: The Prophet said, "When the slave runs away from his master, his Salat (prayer) will not be accepted."[Muslim].Another narration is: "He is guilty of disbelief (i.e., in case he believes in the lawfulness of doing so)."

وعنه عن النبي صلى الله عليه وسلم ‏:‏ ‏"‏إذا أبق العبد، لم تقبل له صلاة ‏"‏ ‏(‏‏(‏رواه مسلم‏)‏‏)‏ ‏.‏ وفي رواية‏:‏ ‏"‏فقد كفر ‏"‏ ‏.‏

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