Al-Israa 17:45

When you recite the Qur’an, We place between you and those who do not believe in the Hereafter an invisible barrier[40].

[40] Preventing guidance from them, for their aversion.

And when you recite the Qur’ān, We put between you and those who do not believe in the Hereafter a concealed partition.[749]

[749] Preventing guidance from reaching them.

45. And when you (Muhammad صلى الله عليه و سلم) recite the Qur’ân, We put between you and those who believe not in the Hereafter, an invisible veil[8] (or screen their hearts, so they hear or understand it not).

[8] (V.17:45) It is said in the Book of Tafsîr (Imâm Qurtubî) as regards this Verse (17:45):
Narrated Sa‘îd bin Jubair رضي الله عنه "When the Sûrah No.111 (Tabbat Yadâ) was revealed, the wife of Abu Lahab came looking for the Prophet صلى الله عليه وسلم while Abu Bakr رضي الله عنه, was sitting beside him. Abu Bakr said to the Prophet صلى الله عليه وسلم: "I wish if you get aside (or go away) as she is coming to us, she may harm you." The Prophet صلى الله عليه وسلم said: "There will be a screen set between me and her." So she did not see him. She said to Abu Bakr: "Your companion is saying poetry against me," Abu Bakr said: "By Allâh, he does not say poetry." She said: "Do you believe that?" Then she left. Abu Bakr said, "O Allâh’s Messenger! She did not see you." The Prophet صلى الله عليه وسلم said: "An angel was screening me from her." [This Hadith is quoted in Musnad Abu Ya‘la.]
It is said that if the above Verse (17:45) is recited by a real believer (of Islâmic Monotheism) he will be screened from a disbeliever. (Allâh knows better). (Tafsîr Al-Qurtubî, Vol.10, Page 269).

And when thou recitest the Qur'an we place between thee and those who believe not in the Hereafter a hidden barrier;