وَمَآ أُرْسِلُوا۟ عَلَيْهِمْ حَـٰفِظِينَ
Sentence structure
مَآ negates passive أُرْسِلُوا۟; its attached wāw is the deputy subject. عَلَيْهِمْ is linked to the verb, and حَـٰفِظِينَ is an accusative circumstance of the deputy subject.
Ayah summary
Yet they had not been sent as guardians over the believers.
وَمَآ — But not
Grammar: وَ coordinates/resumes and مَآ is a non-governing negative particle.
أُرْسِلُوا۟ — they had been sent
Grammar: A Form IV masculine-plural passive perfect. Attached و is the deputy subject and the final alif is orthographic.
عَلَيْهِمْ — over them
Grammar: عَلَى is a preposition and attached هِمْ its genitive pronoun; the phrase is linked to أُرْسِلُوا۟.
حَـٰفِظِينَ — (as) guardians
Grammar: An indefinite masculine-plural active participle functioning as an accusative circumstance of the deputy subject, marked by yā; final nūn is nominal.