وَمَوْتُ مَا لَيْسَ لَهُ نَفْسٌ سَائِلَةٌ فِي الْمَاءِ لَا يُفْسِدُ الْمَاءَ، كَالْبَقِّ وَالذُّبَابِ وَالزَّنَابِيرِ وَالْعَقَارِبِ.
Meaning: The death in water of creatures without flowing blood does not spoil the water, such as bedbugs, flies, wasps and scorpions.
Nafs sa'ilah means blood that flows out; it does not refer here to the creature’s life or soul.
The absence of flowing blood is the stated basis for the rule that these creatures’ death in water does not by itself invalidate the water.