Bede : And when the angel found her by the spring of water in the wilderness on the road to Shur, he said to her, "Hagar, maidservant of Sarai, where have you come from and where are you going?" Consequently, the Egyptian on the road to Shur, which leads through the desert to Egypt, was hastening. For the desert of Shur stretches up to the Red Sea, which reaches the borders of Egypt. — Commentary on Genesis (Hexaemeron) Didymus the Blind : It is well too that Hagar was found "by a spring of water," for beginners find themselves engaged in purifications, which are signified by water. By contrast, those who are more fully matured come into a desert place, no longer needing purifications, having already rid themselves of vices and having been endowed with virtue. — ON Genesis 243 Jerome : (Verse 7) And the angel of the Lord found her by a fountain of water in the desert, by the fountain on the way to Shur. Then the Egyptian woman hurriedly went on the way to Shur, which leads through the desert to Egypt. — Hebrew Questions on Genesis