Jam' Bayn al-Salatayn

Jam' Bayn al-Salatayn is combining two prayers — Dhuhr with Asr, or Maghrib with Isha — into one time window.

What it means for me: This combining, often just called jam', is separate from shortening the prayer. You may bring the later prayer forward, or delay the earlier one back. It exists for real hardship, such as travel.

Example: A traveler lands after a long flight just before Maghrib begins. She prays Maghrib and brings Isha forward, praying both together before the plane's next leg.

Do not confuse with: Qasr, shortening the prayer. Combining changes when a prayer is prayed, not its number of units. Shortening changes the number of units, not the time it is prayed in. The two often happen together while traveling but remain separate concessions.

If scholars differ: Most scholars permit genuinely combining two prayers while traveling. The Hanafi school limits real combining to the Hajj stations at Arafah and Muzdalifah. Elsewhere, it treats each prayer as prayed at the edge of its own time. Scholars also differ on whether rain or illness alone, without travel, justifies combining.