What happens that night? Let Moses himself tell us: “It came about that at midnight Jehovah struck every firstborn in the land of Egypt. ”
فَكَانَ عَلَيْهِمْ أَنْ يَرُشُّوا مِنْ دَمِ حَمَلٍ ذَكَرٍ عَلَى قَوَائِمِ ٱلْأَبْوَابِ وَعَتَبَاتِهَا ٱلْعُلْيَا وَيُلَازِمُوا بُيُوتَهُمْ .‏