Berean Standard Bible (BSB)
The man runs away because he is a hired servant and is unconcerned for the sheep.
World English Bible (WEB)
The hired hand flees because he is a hired hand, and doesn’t care for the sheep.
Strong's King James
{G1161} The hireling{G3411} fleeth{G5343}{(G5719)}, because{G3754} he is{G2076}{(G5748)} an hireling{G3411}, and{G2532}{G846} careth{G3199}{(G5719)} not{G3756} for{G4012} the sheep{G4263}.
The F.O.G *
(13) Because he's a hired hand and He's not concerned about the sheep.
The F.O.G Message *
Young's Literal Translation
and the hireling doth flee because he is an hireling, and is not caring for the sheep.