وعلمكand your knowledge جهلignorance إذاif ماan emphatic particle وثقتyou place your trust
وعلمك جهل إذا ما وثقت
بمنin someone who ليسis not يُؤمَنtrusted منfrom عذرِهhis excuse
بمن ليس يُؤمَن من عذرِه
And your knowledge is ignorance if you place your trust
Your knowledge is ignorance when you trust
in someone whose excuses cannot be trusted.
One whose excuses cannot be believed