▁generally ▁focused ▁on ▁ident ifying ▁sources ▁within ▁a ▁single ▁text . ▁ ▁For ▁example , ▁the ▁modern ▁view ▁of ▁the ▁orig ins ▁of ▁the ▁book ▁of ▁Gen esis ▁was ▁first ▁laid ▁in ▁ 1 7 5 3 ▁by ▁the ▁French ▁phys ician ▁Jean ▁Ast ru c . ▁He ▁pres umed ▁Mos es ▁used ▁ancient ▁documents ▁to ▁write ▁it , ▁so ▁his ▁goal ▁was ▁ident ifying ▁and ▁re construct ing ▁those ▁documents ▁by ▁separ ating ▁the ▁book ▁of ▁Gen esis ▁back ▁into ▁those ▁original ▁sources . ▁He ▁discovered ▁Gen esis ▁altern ates ▁use ▁of ▁two ▁different ▁names ▁for ▁God ▁while ▁the ▁rest ▁of ▁the ▁Pent ate uch ▁after ▁Ex od us ▁ 3 ▁om its ▁that ▁altern ation . ▁He ▁found ▁repet itions ▁of ▁certain ▁events , ▁such ▁as ▁parts ▁of ▁the ▁flo od ▁story ▁that ▁are ▁repeated ▁three ▁times . ▁He ▁also ▁found ▁apparent ▁an ach ron isms : ▁statements ▁seem ingly ▁from ▁a ▁later ▁time ▁than ▁Gen esis ▁was ▁set . ▁Ast ru c ▁hypoth es ized ▁that ▁this ▁separate ▁material ▁was ▁f used ▁into ▁a ▁single ▁unit ▁that ▁became ▁the ▁book ▁of ▁Gen esis ▁thereby ▁creating ▁its ▁dup lications ▁and ▁parallel isms . ▁ ▁Further ▁examples ▁of ▁the ▁products ▁of ▁source ▁criticism ▁include ▁its ▁two ▁most ▁influ ential ▁and ▁well - known ▁theories ▁concerning ▁the ▁orig ins ▁of ▁the ▁Pent ate uch ▁( the ▁Document ary ▁hypothesis ) ▁and ▁the ▁four ▁g osp els ▁( two - source ▁hypothesis ). ▁ ▁Well hausen ' s ▁document ary ▁hypothesis ▁▁ ▁The olog