“سَ” (sa)This word points the meaning toward the future, like “will.”Corpus grammarFUT — prefixed fut particle.
“أُرْهِقُ” (ʾaurhiqu)means “Soon I will cover Him” in this verse. It is a verb. an action or state word. Here it is imperfect verb, verb pattern four.Corpus grammarV — first person singular imperfect verb.
“هُ” (hu,)an attached pronoun meaning “he” or “him.”Corpus grammarPRON — third person masculine singular attached pronoun.