Praised be Thou, O Lord my God! Sanctify mine eye, and mine ear, and my tongue, and my spirit, and my heart, and my soul, and my body, and mine entire being from turning unto anyone but Thee. Give me then to drink from the cup that brimmeth with the sealed wine of Thy glory.Bahá’u’lláh
سُبْحَانَكَ اَللّهُمَّ يَا إِلَهِي طَهِّرْ عَيْنِي ثُمَّ أُذُنِي ثُمَّ لِسَانِي ثُمَّ رُوحِي ثُمَّ قَلْبِي ثُمَّ نَفْسِي ثُمَّ جِسْمِي ثُمَّ جَسَدِي عَنِ التَّوَجُّهِ إِلَى غَيْرِكَ ثُمَّ أَشْرِبْنِي عَنْ كَأْسِ عِزِّكَ الْمَخْتُومِحضرت بهاءالله
« Sanctify mine eye » is a prayer extracted from a Tablet of Baháʼuʼlláh known as the Súratu’l-ʻIbád (Tablet of the Servants), which was revealed in Edirne for Siyyid Mihdí Dahají. The authorized English translation of this passage from that Tablet is available on the Baháʼí Reference Library at this link.
In the original Arabic, the long I sound (“ee”) you hear at the end of every noun is an attached first-person singular pronoun; hence, ʻayn means “eye” and ʻayní means “my eye,” and so on.