The root ح ج ب (ḥ-j-b) in the Quran

وَبَيْنَهُمَا حِجَابٌ وَعَلَى ٱلْأَعْرَافِ رِجَالٌ يَعْرِفُونَ كُلًّۢا بِسِيمَىٰهُمْ وَنَادَوْا۟ أَصْحَٰبَ ٱلْجَنَّةِ أَن سَلَٰمٌ عَلَيْكُمْ لَمْ يَدْخُلُوهَا وَهُمْ يَطْمَعُونَ ۝٤٦

And between them will be a partition [i.e., wall], and on [its] elevations are men who recognize all by their mark. And they call out to the companions of Paradise, "Peace be upon you." They have not [yet] entered it, but they long intensely.

وَإِذَا قَرَأْتَ ٱلْقُرْءَانَ جَعَلْنَا بَيْنَكَ وَبَيْنَ ٱلَّذِينَ لَا يُؤْمِنُونَ بِٱلْـَٔاخِرَةِ حِجَابًا مَّسْتُورًا ۝٤٥

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

فَٱتَّخَذَتْ مِن دُونِهِمْ حِجَابًا فَأَرْسَلْنَآ إِلَيْهَا رُوحَنَا فَتَمَثَّلَ لَهَا بَشَرًا سَوِيًّا ۝١٧

And she took, in seclusion from them, a screen. Then We sent to her Our Angel [i.e., Gabriel], and he represented himself to her as a well-proportioned man.

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ لَا تَدْخُلُوا۟ بُيُوتَ ٱلنَّبِىِّ إِلَّآ أَن يُؤْذَنَ لَكُمْ إِلَىٰ طَعَامٍ غَيْرَ نَٰظِرِينَ إِنَىٰهُ وَلَٰكِنْ إِذَا دُعِيتُمْ فَٱدْخُلُوا۟ فَإِذَا طَعِمْتُمْ فَٱنتَشِرُوا۟ وَلَا مُسْتَـْٔنِسِينَ لِحَدِيثٍ إِنَّ ذَٰلِكُمْ كَانَ يُؤْذِى ٱلنَّبِىَّ فَيَسْتَحْىِۦ مِنكُمْ وَٱللَّهُ لَا يَسْتَحْىِۦ مِنَ ٱلْحَقِّ وَإِذَا سَأَلْتُمُوهُنَّ مَتَٰعًا فَسْـَٔلُوهُنَّ مِن وَرَآءِ حِجَابٍ ذَٰلِكُمْ أَطْهَرُ لِقُلُوبِكُمْ وَقُلُوبِهِنَّ وَمَا كَانَ لَكُمْ أَن تُؤْذُوا۟ رَسُولَ ٱللَّهِ وَلَآ أَن تَنكِحُوٓا۟ أَزْوَٰجَهُۥ مِنۢ بَعْدِهِۦٓ أَبَدًا إِنَّ ذَٰلِكُمْ كَانَ عِندَ ٱللَّهِ عَظِيمًا ۝٥٣

O you who have believed, do not enter the houses of the Prophet except when you are permitted for a meal, without awaiting its readiness. But when you are invited, then enter; and when you have eaten, disperse without seeking to remain for conversation. Indeed, that [behavior] was troubling the Prophet, and he is shy of [dismissing] you. But Allāh is not shy of the truth. And when you ask [his wives] for something, ask them from behind a partition. That is purer for your hearts and their hearts. And it is not [conceivable or lawful] for you to harm the Messenger of Allāh or to marry his wives after him, ever. Indeed, that would be in the sight of Allāh an enormity.

فَقَالَ إِنِّىٓ أَحْبَبْتُ حُبَّ ٱلْخَيْرِ عَن ذِكْرِ رَبِّى حَتَّىٰ تَوَارَتْ بِٱلْحِجَابِ ۝٣٢

And he said, "Indeed, I gave preference to the love of good [things] over the remembrance of my Lord until it [i.e., the sun] disappeared into the curtain [of darkness]."

وَقَالُوا۟ قُلُوبُنَا فِىٓ أَكِنَّةٍ مِّمَّا تَدْعُونَآ إِلَيْهِ وَفِىٓ ءَاذَانِنَا وَقْرٌ وَمِنۢ بَيْنِنَا وَبَيْنِكَ حِجَابٌ فَٱعْمَلْ إِنَّنَا عَٰمِلُونَ ۝٥

And they say, "Our hearts are within coverings [i.e., screened] from that to which you invite us, and in our ears is deafness, and between us and you is a partition, so work; indeed, we are working."

وَمَا كَانَ لِبَشَرٍ أَن يُكَلِّمَهُ ٱللَّهُ إِلَّا وَحْيًا أَوْ مِن وَرَآئِ حِجَابٍ أَوْ يُرْسِلَ رَسُولًا فَيُوحِىَ بِإِذْنِهِۦ مَا يَشَآءُ إِنَّهُۥ عَلِىٌّ حَكِيمٌ ۝٥١

And it is not for any human being that Allāh should speak to him except by revelation or from behind a partition or that He sends a messenger [i.e., angel] to reveal, by His permission, what He wills. Indeed, He is Most High and Wise.

كَلَّآ إِنَّهُمْ عَن رَّبِّهِمْ يَوْمَئِذٍ لَّمَحْجُوبُونَ ۝١٥

No! Indeed, from their Lord, that Day, they will be partitioned.