Matthew Poole and continuators on Genesis 21:21

21 And he dwelt in th wilderness of Paran : and his mother took him a wife out of the land of Egypt .

In the borders of that Wilderness, by comparing Gen. 14. 6. for the innermost parts of it were uninhabitable by Men or Beasts, as antient Writers note.

By which we see both the obligation that lies upon Parents, and the right that is invested in them, to dispose of their Children in Marriage in convenient time. Compare Gen. 24. 4. and 28. 2. Iudg. 14. 2.

Rather than out of Canaan, concerning whose accursed state and future destruction she had been informed in Abrahams house.