“سَ” (sa)This word points the meaning toward the future, like “will.”Corpus grammarFUT — prefixed fut particle.
“يَذَّكَّرُ” (yadhyakkaru)means “He will pay heed” in this verse. It is a verb. an action or state word. Here it is imperfect verb, verb pattern five, third person — masculine — singular.Corpus grammarV — third person masculine singular imperfect verb.