genesis bereshis 26:4-5 and tradition

genesis bereshis 26:4-5 and tradition

to isaac yitzckhak 

and i will make thy linease [zera] to multiply as the stars in the heavens [kokhavim of shomayim] and will give unto your lineage [zera] all these lands and in your lineage [zera] shall all the gentil of the earth [kol barukh goyei ha’aretz ] be blessed

because abraham [avraham] obeyed my voice and was keeper [shomer] over my charge my commandments  my preceptos my engraving statutes and all my laws [mishmeret ve mitzvot ve piqqudim ve khukkot and all sheli torot]