“In kuntu ʿalā bayyinatin min rabbī wa-ātānī raḥmatan min ʿindihi fa-ʿummiyat ʿalaykum”
“If I am upon clear proof from my Lord and He has granted me mercy from Himself, yet it has been obscured from you …” (Hūd 11:28, excerpt)
The verb “ʿummiyat” is feminine. The nearby “raḥmah” is feminine, and “bayyinah” is also feminine. The central idea is that proof and mercy granted by God have not become apparent to those being addressed.
An interpreter must consider possible antecedents in relation to both syntax and meaning. Simply choosing the closest word by position is not always sufficient. The broader discourse concerns the hearers’ resistance to a prophetic claim.