Riyad as-Salihin

Riyad as-Salihin 1769

Prohibition for a Slave to run away from his Master
Arabic hadith text
وعنه عن النبي صلى الله عليه وسلم ‏:‏ ‏"‏إذا أبق العبد، لم تقبل له صلاة ‏"‏ ‏(‏‏(‏رواه مسلم‏)‏‏)‏ ‏.‏ وفي رواية‏:‏ ‏"‏فقد كفر ‏"‏ ‏.‏
Translation
Jarir bin Abdullah (May Allah be pleased with him) said

The Prophet (ﷺ) 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)."