“يَفْقَهُ” (yafqahu)means “That they may understand” in this verse. It is a verb. an action or state word. Here it is imperfect verb, third person — masculine — plural, a command-related form.Corpus grammarV — third person masculine plural jussive imperfect verb.
“وا” (wā)an attached pronoun meaning “they” or “them.”Corpus grammarPRON — third person masculine plural subject pronoun.