Briefly, is it permissible in the state of Seattle, America, to pray the Isha prayer before its late time in summer, based on a fatwa that makes its time moderate like other regions? What is the ruling on repeating the prayer, and what is the responsibility of whoever issued such a fatwa, given that the time for Fajr is moderate?

For the prayer to be valid, the time for it must have entered. It is not permissible to perform the Isha prayer before its time. The fatwa (definition) permitting combining prayers should be examined to ensure its accordance with reality. Some contemporary scholars have allowed combining Maghrib and Isha prayers if the Isha time is delayed due to hardship, but not an hour before its time. If the Isha time is severely delayed, its time is estimated based on the closest country or Makkah. It is permissible to combine Isha with Maghrib as a Jame' Taqdeem (combining by performing the later prayer at the time of the earlier one) to alleviate hardship, based on the Almighty's saying: "Allah intends for you ease and does not intend for you hardship," and His saying: "and has not placed upon you in religion any difficulty." Combining prayers is permissible when there is actual or probable hardship. One should not combine prayers when in doubt about the hardship. Whoever prays Isha before its time must repeat it, though some say that a person who was ignorant is exempt from repeating it.