While researching about arab conquest of afghanistan/south asia region, I found some quotes on Wikipedia of Al Biruni talking about Afghan / Pashtuns, is this authentic? i have doubts
From the eighth century to the ninth century, many inhabitants of what is present-day Afghanistan, Pakistan, and areas of northern India were converted to Sunni Islam. It is surmised from the writings of Al Biruni that some Pashtuns living in Pakhtunkhwa (present-day western Pakistan) had not been completely converted. Al Biruni, writing in Tarikh al Hind, also alludes to the Pashtun tribes of Pakhtunkhwa as being neither Muslim nor Hindu, but simply Afghans which may mean that they practiced Pashtunwali. “ Al Beruni mentions the Afghans once (ed Sachau, I 208)saying that in the western mountains of India live various tribes of Afghans who extend to the neighbourhood of the Sindh (ie Indus )valley .Thus in the eleventh century when the Afghans are first mentioned , they are found occupying the Sulaiman Mountains now occupied by their descendents , the very tribes which the advocates of the exclusive claims of the Durannis will not admit to be true Afghans . Al Beruni no doubt also alludes to them in the passage (loc. Cit .p 199 ) where he says that rebellious savage races , tribes of Hindus , or akin to them inhabit the mountains which form the frontier of India towards the west .[7] ”
“ The most explicit mentioning of the Afghans appears in Al- Baruni’s Tarikh al hind (eleventh century AD) Here it is said that various tribes of Afghans lived in the mountains in the west of India . Al Baruni adds that they were savage people and he describes them as Hindus .,[8]
Islamic conquest of Afghanistan - Wikipedia, the free encyclopedia
From the eighth century to the ninth century, many inhabitants of what is present-day Afghanistan, Pakistan, and areas of northern India were converted to Sunni Islam. It is surmised from the writings of Al Biruni that some Pashtuns living in Pakhtunkhwa (present-day western Pakistan) had not been completely converted. Al Biruni, writing in Tarikh al Hind, also alludes to the Pashtun tribes of Pakhtunkhwa as being neither Muslim nor Hindu, but simply Afghans which may mean that they practiced Pashtunwali. “ Al Beruni mentions the Afghans once (ed Sachau, I 208)saying that in the western mountains of India live various tribes of Afghans who extend to the neighbourhood of the Sindh (ie Indus )valley .Thus in the eleventh century when the Afghans are first mentioned , they are found occupying the Sulaiman Mountains now occupied by their descendents , the very tribes which the advocates of the exclusive claims of the Durannis will not admit to be true Afghans . Al Beruni no doubt also alludes to them in the passage (loc. Cit .p 199 ) where he says that rebellious savage races , tribes of Hindus , or akin to them inhabit the mountains which form the frontier of India towards the west .[7] ”
“ The most explicit mentioning of the Afghans appears in Al- Baruni’s Tarikh al hind (eleventh century AD) Here it is said that various tribes of Afghans lived in the mountains in the west of India . Al Baruni adds that they were savage people and he describes them as Hindus .,[8]
Islamic conquest of Afghanistan - Wikipedia, the free encyclopedia

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