fa-ittabiʿū
then follow
REM – prefixed resumption particle fa + V – 2nd person masculine plural (form VIII) imperative verb + PRON – subject pronoun waw
Root Link: ت ب ع
l-mush'rikīna
the polytheists
DET – determiner prefix al + N – genitive masculine plural (form IV) active participle
Root Link: ش ر ك