▁Ab in ▁( , ▁read ▁as ▁Y os si ▁bar [ S on ▁of ] ▁Ab in ▁( Y er . ▁Tal m ud ); ▁or ▁alternative ▁name ▁recorded ▁in ▁the ▁B . ▁Tal m ud : ▁Jose , ▁the ▁son ▁of ▁R . ▁Bo on ▁[ B un ], ▁in ▁Heb rew : ▁ י ו ס י ▁ ב ר ב י ▁ ב ו ן , ▁read ▁as ▁Y os si ▁Be R ab bi [ S on ▁of ▁Rab bi ] ▁Bon ) ▁was ▁a ▁Jewish ▁Tal m ud ist , ▁known ▁as ▁an ▁am ora ▁of ▁the ▁fifth ▁generation ▁( 4 th ▁century ▁CE ) ▁who ▁lived ▁in ▁the ▁Gal ile e ▁in ▁the ▁Land ▁of ▁Israel . ▁He ▁was ▁the ▁son ▁of ▁Rab ban ▁Ab in ▁I ▁and ▁the ▁teacher ▁of ▁Ab in ▁II . ▁He ▁was ▁at ▁first ▁the ▁pup il ▁of ▁Rab bi ▁Jose ▁of ▁Y od q art , ▁but ▁the ▁latter ' s ▁ind ifference ▁to ▁his ▁own ▁family ▁caused ▁Jose ▁to ▁leave ▁him ▁and ▁follow ▁Ass i . ▁Jose ▁was ▁the ▁most ▁important ▁among ▁the ▁last ▁Hal akh ists ▁of ▁the ▁am ora im ▁of ▁the ▁Land ▁of ▁Israel . ▁He ▁had ▁a ▁thorough ▁knowledge ▁not ▁only ▁of ▁the ▁J ude an ▁custom s ▁and ▁hal ak hot , ▁but ▁of ▁the ▁Bab yl onian , ▁a ▁fact ▁that ▁has ▁led ▁some ▁sch ol ars ▁to ▁maintain ▁that ▁Jose ▁must ▁have ▁res ided ▁at ▁some ▁time ▁in ▁Bab yl onia . ▁It