Genesis 21:3

Sarah

Sarah, type of grace, "the freewoman," and of the "Jerusalem which is above." See (Genesis 17:15); (Galatians 4:22).

2 Isaac is typical in fourfold way:

(1) of the Church as composed of the spiritual children of Abraham (Galatians 4:28).

(2) of Christ as the Son "obedient unto death" (Genesis 22:1); (Philippians 2:5).

(3) of Christ as the Bridegroom of a called-out bride see Gen 24; also, "Church," (Matthew 16:18);

( See Scofield) - (Matthew 16:18).

(4) of the new nature of the believer as "born after the Spirit" (Galatians 4:29).