Muhammad said: "Al-isti'nas" (asking permission/seeking intimacy) in the language means: to inquire or seek to know; you say: "I sought to know (ista'nastu) but I saw no one," meaning: I inquired and sought to recognize. Al-Nabigha said:
(As if my saddle, while the day has passed by us... at Dhu al-Jalil, is upon one that is wary and alone)
He means: a wild bull that caught sight of something and feared it, so he is startled.
Yahya reported from Ibn Lahi'ah, from Abu al-Zubayr, who said: "Jabir ibn 'Abd Allah was asked: 'Should a man ask permission to enter upon his mother, even if she is elderly, or upon his sister?' He replied: 'Yes.'"
Yahya reported from Ibn Lahi'ah, from Yazid ibn Abi Habib; that 'Ali said: "A man should ask permission to enter upon every woman except his own wife."
Surat al-Nur from (Verse 28 to Verse 29).
قَالَ مُحَمَّدٌ: الِاسْتِئْنَاسُ فِي اللُّغَةِ مَعْنَاهُ: الِاسْتِعْلَامُ؛ تَقُولُ: اسْتَأْنَسْتُ فَمَا رَأَيْتُ أَحَدًا؛ أَيْ: اسْتَعْلَمْتُ وَتَعَرَّفْتُ. قَالَ النَّابِغَةُ:
(كَأَنَّ رَحْلِي وَقَدْ زَالَ النَّهَارُ بِنَا … بِذِي الْجَلِيلِ عَلَى مُسْتَأْنَسٍ وَحَدِ)
يَعْنِي: ثَوْرًا أَبْصَرَ شَيْئًا فَخَافَهُ فَهُوَ فَزِعٌ.
يَحْيَى: عَنِ ابْنِ لَهِيعَةَ، عَنْ أَبِي الزُّبَيْرِ قَالَ: " سُئِلَ جَابِرُ بْنُ عَبْدِ اللَّهِ أَيَسْتَأْذِنُ الرَّجُلُ عَلَى وَالِدَتِهِ وَإِنْ كَانَتْ عَجُوزًا، أَوْ عَلَى أُخْتِهِ؟! قَالَ: نَعَمْ ".
يَحْيَى: عَنِ ابْنِ لَهِيعَةَ، عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ؛ أَنَّ عَلِيًّا قَالَ: " يَسْتَأْذِنُ الرَّجُلُ عَلَى كُلِّ امْرَأَةٍ إِلَّا عَلَى امْرَأَتِهِ ".
سُورَة النُّور من (آيَة ٢٨ آيَة ٢٩).