“سَ” (sa)This word points the meaning toward the future, like “will.”Corpus grammarFUT — prefixed fut particle.
“يَهْدِي” (yahdiy)means “He will guide them” in this verse. It is a verb. an action or state word. Here it is imperfect verb, third person — masculine — singular.Corpus grammarV — third person masculine singular imperfect verb.
“هِمْ” (him)an attached pronoun meaning “they” or “them.”Corpus grammarPRON — third person masculine plural attached pronoun.