Studies have not entirely removed confusion on the genetic transit from the descendants of Abraham which scriptures record as the father of the Jews/Hebrews to the modern day groups that say they are his descendants. Culturally the religion of the Jews under the Mosaic Law Covenant have maintained even through the conquering Assyrian, Babylonian, and Roman Dispersions an exclusionary non-mixing anti-Heathen/anti-Gentile relationship with all other ethnic groups, because they comply with their religious Law which specifically forbid marrying or having the offspring of such a relationship with the Heathen "uncircumcised dogs", but virtually none are able because of the capturing, and loss of actual documentation able to absolutely prove that they are Abraham's descendants. Yes, they have intermixed over thousands of years and the proof of the genetic line from Abraham is lost.
The truth is that God ONLY knows those who are 100% descendants, and don't say they don't exist (because you can't, there is no real proof to support that argument), and the scripture plainly states that the members of the Tribes of Judah, Reuben, Gad, Asher, Naphtali, Manassah, Simeon, Levi, Issachar, Zebulun, Joseph, and Benjamin will be anointed by God for His Special task during the seven year Great Tribulation/Wrath on earth. So it's irrelevant men saying that this group or that group aren't Hebrews, the only relevant thing is what God has said about the presence of tribes of Israel who will show up to accomplish God's Will just like the sun comes up every morning.
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