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I.e., it will be too late for repentance. All commentators agree in that the "decision" relates to the unequivocal manifestation of God's will on the Day of Judgment, which is alluded to in the words, "when unto God all things will have been brought back". Since, in the next verse, the children of Israel are addressed, it is possible that this rhetorical question is connected with their refusal, in the time of Moses, to believe in the divine message unless they "see God face to face" (cf. 2:55 ).
Lit., "they" - obviously referring to the people addressed in the preceding two verses.
If faith is wanting, all sorts of excuses are made to resist the appeal of God. They might and do say: "Oh yes! we shall believe if God appears to us with His angels in His glory!" In other words they want to settle the question in their way, and not in God's way. That will not do. The decision in all questions belongs to God. If we are true to Him, we wait for His times and seasons, and do not expect Him to wait on ours.