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-old daughter Lina’s chest again and again. “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. The voice — one only she could hear — had first appeared two months earlier, after suffering a miscarriage. “At that point, I started screaming to the doctor,…

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