Genesis 25:12-18

¹² Now these are the generations of Ishmael, Abraham’s son, whom Hagar the Egyptian, Sarah’s handmaid, bare unto Abraham:

¹³ And these are the names of the sons of Ishmael, by their names, according to their generations: the firstborn of Ishmael, Nebajoth; and Kedar, and Adbeel, and Mibsam,

¹⁴ And Mishma, and Dumah, and Massa,

¹⁵ Hadar, and Tema, Jetur, Naphish, and Kedemah:

¹⁶ These are the sons of Ishmael, and these are their names, by their towns, and by their castles; twelve princes according to their nations.

¹⁷ And these are the years of the life of Ishmael, an hundred and thirty and seven years: and he gave up the ghost and died; and was gathered unto his people.

¹⁸ And they dwelt from Havilah unto Shur, that is before Egypt, as thou goest toward Assyria: and he died in the presence of all his brethren.

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It is generally acknowledged that modern day Arabs are descended from Ishmael.  This understanding comes from the Bible itself, Jewish Rabbis, and from a meager oral tradition.  Mohammed claimed this descent himself, though it is truly impossible to determine his actual pedigree, due to the fact  of the wandering and unsettled nature of the Ishmaelite tribes.  There is no known literature to support any genealogy, outside of the Holy Bible.  The Ishmaelites are mentioned on only three occasions in Scripture: Genesis 37: 25, 27, 29; 39:1, Judges 8:24, and Psalm 83:6.

Most Arabs believe that as the first born of Abraham, Ishmael was offered on the altar, not Issac, and therefore the Biblical Covenants and blessings belong to them, and not the Jews.  However, many nomadic Arabs, still hold to the early pagan traditions from long ago – believing in a law of blood-revenge which requires a man to know his ancestors going back for four generations, but no father back than that.  The physical attributes, language, customs and traditions (pre-Mohammed corruption) along with the infallible testimony of the Holy Bible, makes the Arab nations, largely Ishmaelite in all respects.

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Psalm 83 

83 Keep not thou silence, O God: hold not thy peace, and be not still, O God.

² For, lo, thine enemies make a tumult: and they that hate thee have lifted up the head.

³ They have taken crafty counsel against thy people, and consulted against thy hidden ones.

⁴ They have said, Come, and let us cut them off from being a nation; that the name of Israel may be no more in remembrance.

⁵ For they have consulted together with one consent: they are confederate against thee:

⁶ The tabernacles of Edom, and the Ishmaelites; of Moab, and the Hagarenes;

⁷ Gebal, and Ammon, and Amalek; the Philistines with the inhabitants of Tyre;

⁸ Assur also is joined with them: they have holpen the children of Lot. Selah.

⁹ Do unto them as unto the Midianites; as to Sisera, as to Jabin, at the brook of Kison:

¹⁰ Which perished at Endor: they became as dung for the earth.

¹¹ Make their nobles like Oreb, and like Zeeb: yea, all their princes as Zebah, and as Zalmunna:

¹² Who said, Let us take to ourselves the houses of God in possession.

¹³ O my God, make them like a wheel; as the stubble before the wind.

¹⁴ As the fire burneth a wood, and as the flame setteth the mountains on fire;

¹⁵ So persecute them with thy tempest, and make them afraid with thy storm.

¹⁶ Fill their faces with shame; that they may seek thy name, O Lord.

¹⁷ Let them be confounded and troubled for ever; yea, let them be put to shame, and perish:

¹⁸ That men may know that thou, whose name alone is Jehovah, art the most high over all the earth