Genesis 21:31 (KJV)

Wherefore why; therefore Still heard today: the whys and wherefores, the reasons Webster’s 1828 · Wherefore

What these words mean in the King James Bible, and where you’ll still hear them today.

Abimelech's covenant with AbrahamAbimelech felt sure that the promises of God would be fulfilled to Abraham. It is wise to connect ourselves with those who are blessed of God; and we ought...

Genesis 26:33 And he called it Shebah: therefore the name of the city is Beersheba unto this day.
Genesis 21:14 And Abraham rose up early in the morning, and took bread, and a bottle of water, and gave it unto Hagar, putting it on her shoulder, and the child, and sent her away: and she departed, and wandered in the wilderness of Beersheba.
Genesis 26:23 And he went up from thence to Beersheba.
Joshua 15:28 And Hazarshual, and Beersheba, and Bizjothjah,
Judges 20:1 Then all the children of Israel went out, and the congregation was gathered together as one man, from Dan even to Beersheba, with the land of Gilead, unto the LORD in Mizpeh.
2 Samuel 17:11 Therefore I counsel that all Israel be generally gathered unto thee, from Dan even to Beersheba, as the sand that is by the sea for multitude; and that thou go to battle in thine own person.
1 Kings 4:25 And Judah and Israel dwelt safely, every man under his vine and under his fig tree, from Dan even to Beersheba, all the days of Solomon.

From OpenBible.info, most relevant first.

BeershebaWell of the oath, or well of seven, a well dug by Abraham, and so named because he and Abimelech here entered into a compact (Gen 21:31)....

Wherefore he called עַל ʿal Preposition כֵּן kēn Demonstrative קָרָא qārāʾ קָרָא Verb · qal perfect, third person masculine singular
that place לַמָּקוֹם lammāqôm מָקוֹם Noun · masculine singular · with preposition with the הַהוּא hahûʾ Pronoun · third person masculine singular · with the
Beersheba בְּאֵר bĕʾēr בְּאֵר שֶׁבַע Proper name
because there they sware שָׁבַע šābaʿ Proper name כִּי kî Conjunction שָׁם šām Adverb נִשְׁבְּעוּ nišbĕʿû שָׁבַע Verb · niphal perfect, third person common plural
both of them שְׁנֵיהֶם šĕnêhem שְׁנַיִם Number · masculine dual construct · with suffix: third person masculine plural

Genesis 21:31 KJV