What is the ruling on combining and shortening prayers for one who arrives in Makkah before 'Isha'?

The questioner : A group will say, and they will have stayed there for more than the time of the Qadr prayer. The group of al-Nasr arrived in Makkah after the Maghrib prayer, and they performed the Maghrib and 'Isha prayers combined and shortened before performing 'Isha, knowing that they are aware of the duration they will spend in Makkah.

The Shaykh : There is no blame on them for this. However, if a traveler arrives in a town, he must pray with the Muslims every prayer in its proper time. Consequently, if he prays with the Muslims, he must not shorten, and he has no right to shorten.