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This parenthetical sentence echoes the allusion, in 7:137 , to the period of prosperity and honour which the children of Israel were to enjoy in Palestine after their sufferings in Egypt. The reference to "heritage" is, in this and in similar contexts, a metonym for God's bestowal on the oppressed of a life of well-being and dignity.
The Children of Israel certainly inherited the gardens, springs, treasures, and honourable positions in Palestine after many years' wanderings in the wilderness. But when they were false to Allah, they lost them again, and another people (the Muslims) inherited them when they were true in Faith. "Of such things": literally, "of them".