▁G ers hom . ▁About ▁ 1 0 0 0 ▁CE ▁he ▁called ▁a ▁syn od ▁which ▁decided ▁the ▁following ▁particular s : ▁( 1 ) ▁prohib ition ▁of ▁pol yg amy ; ▁( 2 ) ▁necessity ▁of ▁obtain ing ▁the ▁consent ▁of ▁both ▁parties ▁to ▁a ▁divor ce ; ▁( 3 ) ▁modification ▁of ▁the ▁rules ▁concerning ▁those ▁who ▁became ▁apost ates ▁under ▁comp ulsion ; ▁( 4 ) ▁prohib ition ▁against ▁opening ▁correspond ence ▁addressed ▁to ▁another . ▁ ▁In ▁the ▁modern ▁day , ▁pol yg amy ▁is ▁almost ▁none x istent ▁in ▁Rab bin ic ▁J uda ism . ▁Ash ken azi ▁Jews ▁have ▁continued ▁to ▁follow ▁Rab ben u ▁G ers hom ' s ▁ban ▁since ▁the ▁ 1 1 th ▁century . ▁Some ▁M iz ra hi ▁Jewish ▁communities ▁( part icular ly ▁Y emen ite ▁Jews ▁and ▁Pers ian ▁Jews ) ▁dis cont in ued ▁pol yg yn y ▁more ▁recently , ▁after ▁they ▁imm igr ated ▁to ▁countries ▁where ▁it ▁was ▁forb idden ▁or ▁illegal . ▁Israel ▁prohib its ▁pol yg amy ▁by ▁law . ▁In ▁practice , ▁however , ▁the ▁law ▁is ▁lo os ely ▁enfor ced , ▁primarily ▁to ▁avoid ▁inter ference ▁with ▁Bed ou in ▁culture , ▁where ▁pol yg yn y ▁is ▁pract iced . ▁Pre - ex isting ▁pol yg yn ous ▁un ions ▁among ▁Jews ▁from ▁Arab ▁countries ▁( or ▁other ▁countries ▁where ▁the ▁practice ▁was ▁not ▁prohib ited ▁by ▁their ▁tradition ▁and ▁was ▁not ▁illegal ) ▁are ▁not ▁subject