Or HaChaim on Genesis 17:18/אור החיים על בראשית י״ז:י״ח

1 ויאמר אברהם…לו ישמעאל יחיה לפניך. Abraham said…. "if only Ishmael will live (a righteous life) before You." Abraham prayed that Ishmael should enjoy divine assistance to live as a righteous person. The term "to live before You" is the source for the righteous being called "alive" in our rabbinic literature. Abraham "borrowed" a phrase from Deut. 4,11 where the Torah describes the fact that the Jewish people were "alive" at that time as due to their having cleaved to G'd. Abraham saw the need to pray for this as he had observed negative character tendencies in Ishmael (who was still a minor). Had Ishmael been truly wicked at that time, Abraham, though prejudiced as his father, would have been aware of such wickedness, just as any other righteous person could perceive such things. We have explained in connection with 15,2-3 that Abraham had worried about a son of his not being worthy because G'd described his seeds as comparable to dust. At this point Abraham prayed that Ishmael would turn out to be worthy.