The Quran root ب ط ن b-ṭ-n

إِنَّ الَّذِينَ يَكْتُمُونَ مَا أَنزَلَ اللَّهُ مِنَ الْكِتَابِ وَيَشْتَرُونَ بِهِ ثَمَنًا قَلِيلًا أُولَٰئِكَ مَا يَأْكُلُونَ فِي بُطُونِهِمْ إِلَّا النَّارَ وَلَا يُكَلِّمُهُمُ اللَّهُ يَوْمَ الْقِيَامَةِ وَلَا يُزَكِّيهِمْ وَلَهُمْ عَذَابٌ أَلِيمٌ ١٧٤

بُطُونِهِمْ buṭūnihim · their bellies

Indeed, they who conceal what Allāh has sent down of the Book and exchange it for a small price - those consume not into their bellies except the Fire. And Allāh will not speak to them on the Day of Resurrection, nor will He purify them. And they will have a painful punishment. (Surah Al-Baqarah, 2:174)

إِذْ قَالَتِ امْرَأَتُ عِمْرَانَ رَبِّ إِنِّي نَذَرْتُ لَكَ مَا فِي بَطْنِي مُحَرَّرًا فَتَقَبَّلْ مِنِّي إِنَّكَ أَنتَ السَّمِيعُ الْعَلِيمُ ٣٥

بَطْنِي baṭnī · my womb

[Mention, O Muḥammad], when the wife of ʿImrān said, "My Lord, indeed I have pledged to You what is in my womb, consecrated [for Your service], so accept this from me. Indeed, You are the Hearing, the Knowing." (Surah Ali 'Imran, 3:35)

وَذَرُوا ظَاهِرَ الْإِثْمِ وَبَاطِنَهُ إِنَّ الَّذِينَ يَكْسِبُونَ الْإِثْمَ سَيُجْزَوْنَ بِمَا كَانُوا يَقْتَرِفُونَ ١٢٠

وَبَاطِنَهُ wabāṭinahu · and the secret

And leave [i.e., desist from] what is apparent of sin and what is concealed thereof. Indeed, those who earn [blame for] sin will be recompensed for that which they used to commit. (Surah Al-An'am, 6:120)

يَا أَيُّهَا الَّذِينَ آمَنُوا لَا تَتَّخِذُوا بِطَانَةً مِّن دُونِكُمْ لَا يَأْلُونَكُمْ خَبَالًا وَدُّوا مَا عَنِتُّمْ قَدْ بَدَتِ الْبَغْضَاءُ مِنْ أَفْوَاهِهِمْ وَمَا تُخْفِي صُدُورُهُمْ أَكْبَرُ قَدْ بَيَّنَّا لَكُمُ الْآيَاتِ إِن كُنتُمْ تَعْقِلُونَ ١١٨

بِطَانَةً biṭānatan · (as) intimates

O you who have believed, do not take as intimates those other than yourselves [i.e., believers], for they will not spare you [any] ruin. They wish you would have hardship. Hatred has already appeared from their mouths, and what their breasts conceal is greater. We have certainly made clear to you the signs, if you will use reason. (Surah Ali 'Imran, 3:118)

قُلْ تَعَالَوْا أَتْلُ مَا حَرَّمَ رَبُّكُمْ عَلَيْكُمْ أَلَّا تُشْرِكُوا بِهِ شَيْئًا وَبِالْوَالِدَيْنِ إِحْسَانًا وَلَا تَقْتُلُوا أَوْلَادَكُم مِّنْ إِمْلَاقٍ نَّحْنُ نَرْزُقُكُمْ وَإِيَّاهُمْ وَلَا تَقْرَبُوا الْفَوَاحِشَ مَا ظَهَرَ مِنْهَا وَمَا بَطَنَ وَلَا تَقْتُلُوا النَّفْسَ الَّتِي حَرَّمَ اللَّهُ إِلَّا بِالْحَقِّ ذَٰلِكُمْ وَصَّاكُم بِهِ لَعَلَّكُمْ تَعْقِلُونَ ١٥١

بَطَنَ baṭana · (is) concealed

Say, "Come, I will recite what your Lord has prohibited to you. [He commands] that you not associate anything with Him, and to parents, good treatment, and do not kill your children out of poverty; We will provide for you and them. And do not approach immoralities - what is apparent of them and what is concealed. And do not kill the soul which Allāh has forbidden [to be killed] except by [legal] right. This has He instructed you that you may use reason." (Surah Al-An'am, 6:151)

أَلَمْ تَرَوْا أَنَّ اللَّهَ سَخَّرَ لَكُم مَّا فِي السَّمَاوَاتِ وَمَا فِي الْأَرْضِ وَأَسْبَغَ عَلَيْكُمْ نِعَمَهُ ظَاهِرَةً وَبَاطِنَةً وَمِنَ النَّاسِ مَن يُجَادِلُ فِي اللَّهِ بِغَيْرِ عِلْمٍ وَلَا هُدًى وَلَا كِتَابٍ مُّنِيرٍ ٢٠

وَبَاطِنَةً wabāṭinatan · and hidden

Do you not see that Allāh has made subject to you whatever is in the heavens and whatever is in the earth and amply bestowed upon you His favors, [both] apparent and unapparent? But of the people is he who disputes about Allāh without knowledge or guidance or an enlightening Book [from Him]. (Surah Luqman, 31:20)