The word(s) "series" appears 2 time(s) in 2 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) O People of the Book! Now hath come unto you, making (things) clear unto you, Our Messenger, after the break in (the series of) our messengers, lest ye should say: "There came unto us no bringer of glad tidings and no warner (from evil)": But now hath come unto you a bringer of glad tidings and a warner (from evil). And Allah hath power over all things.

(2) This is a Warner, of the (series of) Warners of old!