The ruling on varying the number of rak'ahs in tarawih

Question:
Is it better for the imam to vary the number of rak'ahs, or to limit it to eleven rak'ahs?

Answer:
I am not aware of any harm in this. If he prays eleven rak'ahs on some nights and thirteen on others, there is nothing wrong with it. If he increases the number, there is no harm in that either. The matter is broad regarding the night prayer. However, if he limits it to eleven in order to establish the Sunnah and so that people know his prayer, so that they do not think he is forgetful, there is no blame on him for that.