World Wide Study Bible
a Bible passage
17. But when—rather, "as."
the time of the promise—that is, for its fulfilment.
the people grew and multiplied in Egypt—For more than two hundred years they amounted to no more than seventy-five souls; how prodigious, then, must have been their multiplication during the latter two centuries, when six hundred thousand men, fit for war, besides women and children, left Egypt!