«إذا المرء لم يخزن عليه لسانه / فليس على شيء سواه بخزّان»
If someone does not guard his tongue, he is unlikely to guard anything else.
Yakhzun appears in the first hemistich and khazzān closes the second. Their lexical relationship evokes guarding and restraint.
The ending recalls the opening condition and turns restraint of the tongue into a measure of broader self-control.