كتاب الأمور المنهي عنها
18
The Book of the Prohibited actions
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)."

وعنه عن النبي صلى الله عليه وسلم ‏:‏ ‏"‏إذا أبق العبد، لم تقبل له صلاة ‏"‏ ‏(‏‏(‏رواه مسلم‏)‏‏)‏ ‏.‏ وفي رواية‏:‏ ‏"‏فقد كفر ‏"‏ ‏.‏
Sunnah.com reference : Book 18, Hadith 259
Arabic/English book reference : Book 18, Hadith 1769