The ruling on combining prayers and performing tayammum while traveling if water is ahead of them

Question:
The Shaykh said: There was a group traveling, and when the time for the Maghrib prayer arrived, they had the Maghrib prayer to perform, even though there was a city ahead of them, about an hour away, which had water. So, is it permissible for them to combine the Maghrib prayer with the 'Isha' prayer in that city where the water is, knowing that they are traveling?

Answer:
We have already given the answer to this. We said: If the time for prayer arrives and he has no water with him, but there is water ahead of him that he can reach before the time expires, then he has a choice. If he wishes, he can pray at the beginning of the time and combine the two prayers; doing so is valid, and praise be to Allah. If he wishes, he can delay it until he reaches the water, and this is better. This is better if he is more likely to reach the water before the time expires. However, if he prays with tayammum, his prayer is valid. So, those who prayed at the beginning of the time and combined their prayers have a valid prayer, and praise be to Allah.