«وأما بيان التغيير فهو أن يتغيَّر ببيانه معنى كلامه»
Bayan al-taghyir occurs when the later clarification modifies the meaning or legal scope of what was said earlier.
The supplementary words neither merely confirm an apparent meaning nor explain an unknown referent. They change the time of operation, the amount, or the reach of the original statement. A condition and an exception are leading examples.
Condition: “You are divorced if you enter the house” — the effect is made conditional.
Exception: “I owe ten dirhams except three” — the acknowledged amount becomes seven.
Removing the qualifying words changes the legal outcome. The interpreter must therefore ask whether the modification formed one connected utterance with the earlier statement.