It was also said: “Except as your Lord wills” refers, for both groups, to the span of their lives in this world and their confinement in the barzakh between death and resurrection, before they reach Paradise or the Fire. That is, they will abide forever in Paradise or the Fire, apart from this period.
It was also said that “except as your Lord wills” means: apart from what your Lord wills—that is, abiding therein as long as the heavens and the earth endure, apart from what your Lord wills (1): namely, an additional duration beyond the measure of the heavens’ and earth’s endurance. This is what abiding forever therein means. It is like saying, “I owe so-and-so one thousand, apart from the two thousand,” meaning: besides the two thousand previously mentioned.
It was also said that “except” has the meaning of “and”: that is, your Lord has willed that these people abide forever in the Fire and those people abide forever in Paradise. This is like His saying: “So that the people will have no argument against you, nor will those who have wronged.” (al-Baqarah 150)
It was also said that its meaning is: Even if your Lord willed, He could bring them out of it; but He does not will to do so, for He has decreed that they shall abide therein forever.
Al-Farra’ said: This is an exception Allah has mentioned but will not carry out, like your saying, “By Allah, I shall strike you unless I see otherwise,” while you are resolved to strike him. (2)
“Indeed, your Lord is Doer of whatever He wills.”
“And as for those who were blessed, they will be in Paradise, abiding therein as long as the heavens and the earth endure, except as your Lord wills—an uninterrupted gift.” (108)
Regarding His saying, “And as for those who were blessed”: Hamzah, al-Kisa’i, and Hafs read it as “were granted blessedness,” with a u-vowel on the first consonant [and an i-vowel on the second], meaning that they were granted felicity. The forms “was blessed” and “was granted blessedness” have one and the same meaning. The others read it with an a-vowel on the first consonant, by analogy with “were wretched.”
“As long as the heavens and the earth endure, except as your Lord wills”: Al-Dahhak said: “Except for the time they remained in the Fire until they were admitted into Paradise.” Qatadah said: “Allah knows best the meaning of His exception.”
“An uninterrupted gift”: that is, one that will not be cut off. Ibn Zayd said: Allah, exalted is He, has informed us of what He wills for the people of Paradise, saying, “an uninterrupted gift”; but He has not informed us of what He wills for the people of the Fire.