Kan arrabni dhalchu, kormi hindhalchu
What the tongue breeds, the bull cannot.
A sharp tongue produces what no bull could: humiliating words that start quarrels. Careless words can begin feuds that last long after the conversation ends.
Arrabni lafee hinqabdu lafee namaa cabsiti
The tongue has no bones, but it can break bones.
Words leave no visible mark like a blow, so it's easy to underestimate them. Speech, though it has no substance, can do real and lasting harm.