Abraham Chiasm

A Go forth from your father's house (Gen. 12:1-6)
   B Unto thy seed I will give this land (12:7-9)
      C Abram says Sarai is his sister and Pharaoh takes her (12:10-20)
         D Lot settles in Sodom (13:1-18)
            E Abraham rescues Lot (14:1-24)
               F God promises Abram an heir (15:1-8)
                  G The Covenant Between the Pieces (15:9-21)
                     H Birth of Ishmael (16:1-16)
                  G' The Covenant of Circumcision (17:1-27)
               F' Sarah is informed that she will have a child (18:1-15)
            E' Angels rescue Lot (18:16-19:22)
         D' God destroys Sodom (19:23-38)
      C' Abraham says Sarah is his sister and Abimelech takes her (20:1-18)
   B' Birth of Isaac, the promised seed (21:1-8)
A' Hagar and Ishmael sent into wilderness (21:9-14)

Go forth from your father's house		12:1-6	21:9-14		Hagar and Ishmael sent into wilderness
Unto thy seed will I give this land		12:7-9	21:1-8		Birth of Isaac, the promised seed
Abram says Sarai is his sister		12:10-13	20:8-18		Abimelech restores Sarah and welcomes Abraham with gifts
Pharaoh takes Sarai, treats Abram well		12:14-16	20:7		God tells
God reveals		12:17	20:2b		Abimelech takes Sarah
Pharaoh sends Abram off		12:18-20	20:1-2a		Abraham says Sarah is his sister
Abram and Lot over-populate the land		13:1-7	19:30-38		Lot's daughters re-populate the land through their father
Abram gives Lot his choice of land		13:8-13	19:29		God remembered Abraham and Lot
God gives Abram the whole land		13:14-18	19:27-28		Abraham looks down on the destruction of the valley
Kings of the valley destroy each other		14:1-12	19:23-26		God destroys cities of the valley
Abraham rescues Lot		14:13-16	19:1-22		Angels rescue Lot
The king of Sodom praises God for Abram		14:17-18	18:20-33		Abraham pleads with God for Sodom
Melchizedek blesses Abram		14:19-24	18:16-19		God acts because Abraham will be blessed
One from your own body will be your heir		15:1-8	18:1-15		Sarah your wife shall have a son
The Covenant Between the Pieces - Abram's part		15:9-12	17:23-27		The Covenant of Circumcision - Abram's part
Your seed will be strangers in a foreign land		15:13-16	17:15-22		Kings of peoples shall come from Sarah
The Covenant Between the Pieces - God's part		15:17	17:9-14		The Covenant of Circumcision - God's part
To your descendants I have given this land		15:18-21	17:1-8		I will give to you and to your offspring after you the land
Sarai had borne no children		16:1-2	16:16b		Hagar bore Ishmael
Abram had lived 10 years		16:3	16:16a		Abram was eighty-six
He went in to Hagar, and she conceived		16:4a	16:15		Hagar bore Abram a son
Her mistress was dispised in her sight		16:4b	16:13-14		You are a God who sees
May the wrong done to me be upon you		16:5a	16:12		His hand will be against all, and theirs against him.
The Lord judge between us		16:5b	16:11		The Lord has given heed to his affliction
Abram speaks to Sarai		16:6a	16:10		The angel speaks to Hagar
Your maid is in your power		16:6b	16:9c		Submit yourself to her authority
She fled from her presence		16:6c	16:9b		Return to your mistress
The angel finds Hagar and says		16:7	16:9a		The angel speaks to Hagar
Hagar, Sarai's maid,		16:8a	16:8g		my mistress Sarai
Where have you come from and		16:8b	16:8f		the presence of
Where are you going?		16:8c	16:8e		I am fleeing from
Hagar (16:8d)

That is not right. Hagar does not belong there. This is what it would look like if Ishmael was dropped from the Bible:

Go forth from your father's house		12:1-6	21:9-14		Hagar and Ishmael sent into wilderness
Unto thy seed will I give this land		12:7-9	21:1-8		Birth of Isaac, the promised seed
Abram says Sarai is his sister		12:10-13	20:8-18		Abimelech restores Sarah and welcomes Abraham with gifts
Pharaoh takes Sarai, treats Abram well		12:14-16	20:7		God tells
God reveals		12:17	20:2b		Abimelech takes Sarah
Pharaoh sends Abram off		12:18-20	20:1-2a		Abraham says Sarah is his sister
Abram and Lot over-populate the land		13:1-7	19:30-38		Lot's daughters re-populate the land through their father
Abram gives Lot his choice of land		13:8-13	19:29		God remembered Abraham and Lot
God gives Abram the whole land		13:14-18	19:27-28		Abraham looks down on the destruction of the valley
Kings of the valley destroy each other		14:1-12	19:23-26		God destroys cities of the valley
Abraham rescues Lot		14:13-16	19:1-22		Angels rescue Lot
The king of Sodom praises God for Abram		14:17-18	18:20-33		Abraham pleads with God for Sodom
Melchizedek blesses Abram		14:19-24	18:16-19		God acts because Abraham will be blessed
I will give you and your offspring after you the land		15:1-21; 17:1-8	18:1-15		Sarah will bear a child
The Covenant of Circumcision - God's part		17:9-14	17:23-27		The Covenant of Circumcision - Abram's part
God speaks to Abraham		17:15	17:22		God finished talking with Abraham
I will give you a son by Sarah		17:16a	17:21b		Sarah will bear Isaac next year
I will bless her		17:16b	17:21a		I will covenant with him
She shall be nations		17:16c	17:20d		I will make him a great nation
Kings of people will come from her		17:16d	17:20c		Father of twelve princes
We are too old to have children		17:17	17:20b		I will make him fruitful and multiply him exceedingly.
I will covenant with him		17:19	17:20a		I will bless him
Everlasting covenant (17:19)

Just goes to show that you can't make these things completely up – they have to conform to what's really there.

After Rachel Yudkowsky, http://jbq.jewishbible.org/assets/Uploads/352/352_chiasm.pdf, Rabbi David Fohrman, http://www.davidfohrman.com/download.cfm?id=107, and Kevin Scott, http://storage.cloversites.com/metropolitanbiblechurch/documents/Pentateuch%20-%20W2.doc

   Abraham Chiasm