(قول "مرحبا يا عالم!")
قول = say مرحبا = hello/welcome يا = oh عالم = world
(قول "مرحبا يا عالم!"))
You need to put a 0x200F (Unicode's right-to-left-mark) both before and after the text, so the neutrally-directed characters ( ) and " will inherit the directionality of the Arabic text, instead of the top-level left-to-right context.
(قول "مرحبا يا عالم!")