“لِّ” (lli)This prefix expresses purpose, like “in order to.”Corpus grammarPRP — prefixed prp particle.
“تَسْلُكُ” (tasluku)means “That you may go along” in this verse. It is a verb. an action or state word. Here it is imperfect verb, second person — masculine — plural, a dependent form.Corpus grammarV — second person masculine plural subjunctive imperfect verb.
“وا” (wā)an attached pronoun meaning “you all.” It shows who is being addressed.Corpus grammarPRON — second person masculine plural subject pronoun.