In that he himself hath suffered being tempted (ἐν ᾧ γὰρ πέπονθεν αὐτὸς πειρασθείς)
Rend. for having himself been tempted in that which he suffered. The emphasis is on having been tempted. Christ is the succored of the tempted because he has himself been tempted. Ἐν ᾧ is not inasmuch as, but means in that which. Ἐν ᾧ πέπονθεν qualifies πειρασθείς, explaining in what the temptation consisted, namely, in suffering.