‘Asr and the traveller
Question

                A person is travelling and at a given destination he offers salaatul 'Asr. Then he continues his journey and when he arrives at
his destination, he discovers that the time of 'Asr has not even entered yet. Does he now have to offer 'Asr again? Please note that there are several such scenarios and so I would appreciate that you shed some light on the topic.
Praise be to Allah.He does not have to pray Asr a second time,
    because when he combined Asr with Zuhr, he was in a state when doing so is
    permitted, and he did not know for sure when he combined the two prayers that he would
    reach his destination before Asr. Even if he did know for sure when he combined
    Asr with Zuhr that he would reach his destination before Asr, it is still
    permissible for him to join the two prayers, as was stated in a fatwa by many of the
    scholars.
This scenario resembles another, which is when a man cannot find water,
    so he prays with tayammum (dry ablution performed with sand or earth),
    then he finds water before the time for that prayer is over: he does not have to repeat
    the prayer.
In the case of the traveller, the time of Zuhr is in fact the time of Zuhr
    and Asr, and the time of Asr is the time of Asr and Zuhr. And Allaah knows best.