For any of you who are still in doubt about Pashtun Israelite origins, here is an academic source.
The islam Encycyclopedia, published by the Turkish Ministry of Education, (with a board of zillions of professors of religion) is considered to be the top most authoritative source here for religious matters. It's available at the Turkish Congress, and at all university libraries.
Volume 4, page 1134-1178 pertains to Efganistan.
Pg: 1136: parag. 8: ... The Durrani and the Galzay tribes originate from the ibrani (dictionary says: the Hebrew people). . . Parag 9: ...And it is asserted that many others of the Afghan composition are originally of the ibrani as well.
Page 1137: parag. 4: ...The name of Pathan was first observed in the XVI century. The etymology of Pathan is not Arabic. One interpretation is that it means keel of a ship; Which leads one to consider whether it could be related to Hazreti Abraham having bestown the name to these people..
Page 1138: parag. 2: ... Bellow puts forward the theory that they are related to the Armenians, a theory that has no solid base to it. Same page, Parag. 3: ... The theory first put forth by Bellow, Yule, Holdich, and to a certain degree by Raverty as well, that the Afghan, and especially the Durrani Afghans, are ibrani, finds solid base and is credible.
End of academic source.
It has already been pointed out on this list that not all Pashtun tribes are of Israelite origin. The Pashtun are not a single ethnic group, contrary to current portrayals in the media. Also it is the non-Israelite tribes who tend to be more forthcoming about their origins
To my knowledge the Israelite tribes are the Durrani and Galzay mentioned above, and the Rabbani, Shinwari, Levani, Deftali, and Jaji from Afghanistan, and the Efridi and Yusufzai from Pakistan. (Some of those listed above may be sub-tribes of some of the others, I don't really know.) Some sources claim that the Ashurai are also an Israelite tribe but I have not seen any confirmation, and other sources suggest they are descendents of ancient Assyrians (the ones who exiled the Israelites in the first place).