God has made laughter for me: Meaning to say that is why jis name is called Yitzchak - since people will laugh (yitzchaku) at me, saying, "Have you seen Sarah, she gave birth at 90 years, and she began now to [...]."

Who would have declared to Avraham: Meaning to say, who would have said to Avraham that this thing occurred - that Sarah nursed children? No one would have said this to him, since he would not have believed [it] and [the speaker] would have been in his eyes, like a joker.

For the son of this maidservant shall not inherit: Meaning to say, it is not right that the son of the maidservant inherit with my son. And therefore I do not want that he should live here, lest he should say after our death, "I am also the son of Avraham," and come to inherit.

And this thing was very bad: Meaning to say, it was difficult in his eyes about Hagar, but it was very difficult for him about his son. Therefore He said to him (Genesis 21:12), "Do not let it be bad in your eyes concerning the youth and concerning your maidservant."

For it is through Yitzchak that your seed will be called: Your main seed is Yitzchak; that seed about which He said, "to you and to your seed will I give this land" (Genesis 13:15).

He placed on her shoulder the skin [of water] and the bread; but the child [he placed] into her hands, since he was fourteen.

And she cast the child: From [the time] when he fainted from thirst, she began to carry him.

An angel of God from heaven: Angels that appear to people on the earth are in the image of people; it is not known that they are angels, as it is not the way of the Holy One, blessed be He, to reveal [them]. But it is known that the one that is speaking from the heaven is an angel [and not God], since he said, "because God has heard the voice of the youth"; and he did not say, "I heard."

Archer (lit., One who draws [roveh] the bow): One who draws is one who pulls. It is as [in], "They made him bitter and they shot (robu)" (Genesis 49:23); and as [in], "His archers (rabav) surrounded me." A bow: [This means] with a bow. And some say roveh is like, a youth. It is like, "The youths rovim will get their answer" (Chullin 20a); and like "the youth," is ravia in the Targum (Aramaic translation of the Bible). Meaning, a youth that is a master of the bow.