“I didn’t want to do what the voice was telling me, but at the same time, I felt like it was going to make me do it,” she told The Post.

Aaisha Alvi was sitting in a doctor’s office when she first heard the command.

Stab Lina! Stab Lina! Stab Lina!

At the same time, she saw a vision of a long carver knife plunging into her 4-year-ol…