“يَسَْلُ” (yasalu)means “They ask you” in this verse. It is a verb. an action or state word. Here it is imperfect verb, third person — masculine — plural.Corpus grammarV — third person masculine plural imperfect verb.
“ونَ” (wna)an attached pronoun meaning “they” or “them.”Corpus grammarPRON — third person masculine plural subject pronoun.
“كَ” (ka)an attached pronoun meaning “you” when speaking to one man.Corpus grammarPRON — second person masculine singular attached pronoun.