Al-Qalam 68:7

Inna rabbaka huwa aAAlamu biman dallaAAan sabeelihi wahuwa aAAlamu bilmuhtadeen

Indeed, your Lord is most knowing of who has gone astray from His way, and He is most knowing of the [rightly] guided.

Surely your Lord knows best who has strayed from his way, and He is well aware of those who are on the right path.