wa-innahu
And indeed it
CONJ – prefixed conjunction wa (and) + ACC – accusative particle inna + PRON – 3rd person masculine singular possessive pronoun ha
Root Link: ا ن ن
laqasamun
(is) surely an oath
EMPH – emphatic prefix lām + N – nominative masculine indefinite noun
Root Link: ق س م
taʿlamūna
you know
V – 2nd person masculine plural imperfect verb + PRON – subject pronoun ūna
Root Link: ع ل م