وَلَا تَجَسَّسُوا وَلَا يَغْتَبْ بَعْضُكُمْ بَعْضًا
Do not spy, nor let any of you backbite another.
Two prohibitions appear in sequence: spying and backbiting. They belong to a common ethical setting but prohibit different behaviours; distinguishing them matters more than merely counting repeated lā.
Conjunction places the acts within one moral discourse, but does not prove a necessary causal chain in which every act of backbiting must be preceded by spying.