وَلَا تَقْتُلُوا أَوْلَادَكُمْ خَشْيَةَ إِمْلَاقٍ (Quran 17:31)
Do not kill your children for fear of poverty.
- لَا تَقْتُلُوا prohibits the action.
- أَوْلَادَكُمْ is the maf'ul bihi.
- خَشْيَةَ إِمْلَاقٍ explains the motive mentioned for that action: fear of poverty.
The key question remains: Why? — because of fear of poverty.