Overview
Genesis 21:1, Isaac is born, and circumcised; Genesis 21:6, Sarah’s joy; Genesis 21:8, Isaac is weaned; Genesis 21:9, Hagar and Ishmael are cast forth; Genesis 21:15, Hagar in distress; Genesis 21:17, The angel relieves and comforts her; Genesis 21:23, Abimelech’s covenant with Abraham at Beer-sheba.

God: Genesis 17:17, Genesis 18:12-15, 1 Samuel 1:26-28, 1 Samuel 2:1-10, Psalms 113:9, Psalms 126:2, Isaiah 49:15, Isaiah 49:21, Isaiah 54:1, Luke 1:46-55, John 16:21, John 16:22, Galatians 4:27, Galatians 4:28, Hebrews 11:11
to laugh: Sarah most likely remembered the circumstance mentioned in Genesis 18:12, and also the name Isaac, which implies laughter.
will laugh: Luke 1:14, Luke 1:58, Romans 12:15
Reciprocal: Genesis 17:19 - Sarah Genesis 21:3 - General Job 8:21 - he fill Proverbs 13:12 - when Ecclesiastes 3:4 - a time to laugh Jeremiah 20:15 - A man Luke 6:21 - ye shall laugh

Cast out: The word rendered "cast out," signifies also to divorce. See note on Leviticus 21:7. In this latter sense, it may be understood here. Genesis 25:6, Genesis 25:19, Genesis 17:19, Genesis 17:21, Genesis 20:11, Genesis 22:10, Genesis 36:6, Genesis 36:7, Matthew 8:11, Matthew 8:12, Matthew 22:13, John 8:35, Galatians 4:22-31, 1 John 2:19
heir: John 8:35, Galatians 3:18, Galatians 4:7, 1 Peter 1:4, 1 John 2:19
Reciprocal: Genesis 16:1 - bare Genesis 24:36 - unto Genesis 25:5 - General Genesis 25:9 - Isaac Genesis 30:4 - to wife Exodus 18:23 - God 1 Chronicles 1:28 - Ishmael Proverbs 22:10 - General Ezekiel 16:5 - but thou Galatians 3:29 - Abraham's Galatians 4:30 - Cast

am 2112, bc 1892
rose up: Genesis 19:27, Genesis 22:3, Genesis 24:54, Genesis 26:31, Psalms 119:60, Proverbs 27:14, Ecclesiastes 9:10
took: Genesis 25:6, Genesis 36:6, Genesis 36:7
child: Or, youth - See note on Genesis 21:12, and See note on Genesis 21:20, as Ishmael was now 16 or 17 years of age.
sent: John 8:35
wandered: Genesis 16:7, Genesis 37:15, Psalms 107:4, Isaiah 16:8, Galatians 4:23-25
Beersheba: So called when Moses wrote; but not before Abraham's covenant with Abimelech, Genesis 21:31. Such instances of the figure prolepsis are not infrequent in the Pentateuch Genesis 21:33, Genesis 22:19, Genesis 26:33, Genesis 46:1, 1 Kings 19:3
Reciprocal: Genesis 21:15 - the water Genesis 24:15 - pitcher Genesis 25:18 - Havilah Joshua 15:28 - Beersheba Daniel 1:4 - Children

the water: Genesis 21:14, Exodus 15:22-25, Exodus 17:1-3, 2 Kings 3:9, Psalms 63:1, Isaiah 44:12, Jeremiah 14:3
and she cast the child: Or, "and she sent the lad," to screen him from the intensity of the heat.
Reciprocal: 1 Kings 17:10 - Fetch me 1 Kings 19:4 - sat down

reproved: Genesis 26:15-22, Genesis 29:8, Exodus 2:15-17, Judges 1:15, Proverbs 17:10, Proverbs 25:9, Proverbs 27:5, Matthew 18:15
because: Wells of water were of great consequence in those hot countries, especially where the flocks were numerous; because water was scarce, and digging to find it was attended with the expense of much time and labour.
servants: Genesis 13:7, Genesis 26:15-22, Exodus 2:16, Exodus 2:17
Reciprocal: Genesis 26:20 - did strive Leviticus 6:4 - which he

I wot: "Wot," though used for the present, is the past tense of the almost obsolete word "to wit," from the Saxon witan, to know. Genesis 13:7, 2 Kings 5:20-24
Reciprocal: Genesis 44:15 - wot ye not Exodus 32:1 - we wot Acts 3:17 - wot Philippians 1:22 - I wot

called: Genesis 26:33
Beersheba: i.e., The well of the oath, or the well of the seven: alluding to the seven ewe lambs. The verb rendered "to swear" is derived from the word translated seven. Genesis 21:14, Genesis 26:23, Joshua 15:28, Judges 20:1, 2 Samuel 17:11, 1 Kings 4:25
Reciprocal: Genesis 16:14 - General Genesis 22:19 - to Beersheba Genesis 26:18 - and he Genesis 26:28 - Let there Genesis 26:31 - sware Genesis 46:1 - Beersheba Joshua 19:2 - and Moladah 2 Samuel 24:7 - to Beersheba 1 Kings 19:3 - Beersheba 2 Kings 23:8 - Beersheba Nehemiah 11:27 - General Hebrews 6:16 - an oath

grove: or, tree, Amos 8:14, The original word eshel, has been variously translated a grove, a plantation, an orchard, a cultivated field, and an oak; but it may denote a kind of tamarisk, as it is rendered by Gesenius, the same with the Arabic athl.
Beersheba: Deuteronomy 16:21, Judges 3:7
called: Genesis 4:26, Genesis 12:8, Genesis 26:23, Genesis 26:25, Genesis 26:33
on the name: Dr. Shuckford justly contends, that the expression rendered, "he called on the name," signifies "he invoked in the name."
everlasting: Deuteronomy 33:27, Psalms 90:2, Isaiah 40:28, Isaiah 57:15, Jeremiah 10:10, Romans 1:20, Romans 16:26, 1 Timothy 1:17
Reciprocal: Genesis 13:1 - the south Genesis 14:22 - possessor Genesis 21:14 - Beersheba Genesis 28:22 - God's Genesis 33:20 - altar Genesis 46:1 - Beersheba Leviticus 17:5 - in the open 2 Chronicles 19:4 - Beersheba Amos 5:5 - Beersheba