A man traveled after the 'Isha' adhan, then prayed 'Isha' shortened!
Machine translationRead the Arabic original
Question:
He says: Honorable Shaykh, may Allah grant you success, I left as a traveler after praying Maghrib, heading to Makkah. Before leaving the buildings, I heard the 'Isha' adhan, so I did not pray 'Isha' until after I had left Riyadh. I prayed 'Isha' as two rak'ahs. Is my action valid? No.
Answer:
If the time became obligatory for you before you left the town from which you traveled, then it is obligatory for you to pray it in full. You must pray it in full, so you must make up this prayer as four rak'ahs. Yes.
He says: Honorable Shaykh, may Allah grant you success, I left as a traveler after praying Maghrib, heading to Makkah. Before leaving the buildings, I heard the 'Isha' adhan, so I did not pray 'Isha' until after I had left Riyadh. I prayed 'Isha' as two rak'ahs. Is my action valid? No.
Answer:
If the time became obligatory for you before you left the town from which you traveled, then it is obligatory for you to pray it in full. You must pray it in full, so you must make up this prayer as four rak'ahs. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [2379 -2802] رجل سافر بعد أذان العشاء، ثم صلى العشاء قصرا! - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.