The Quran root ر ب ب r-b-b

الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ ٢

رَبِّ rabbi · the Lord

[All] praise is [due] to Allāh, Lord of the worlds - (Surah Al-Fatihah, 1:2)

أُولَٰئِكَ عَلَىٰ هُدًى مِّن رَّبِّهِمْ وَأُولَٰئِكَ هُمُ الْمُفْلِحُونَ ٥

رَّبِّهِمْ rabbihim · their Lord

Those are upon [right] guidance from their Lord, and it is those who are the successful. (Surah Al-Baqarah, 2:5)

مَا كَانَ لِبَشَرٍ أَن يُؤْتِيَهُ اللَّهُ الْكِتَابَ وَالْحُكْمَ وَالنُّبُوَّةَ ثُمَّ يَقُولَ لِلنَّاسِ كُونُوا عِبَادًا لِّي مِن دُونِ اللَّهِ وَلَٰكِن كُونُوا رَبَّانِيِّينَ بِمَا كُنتُمْ تُعَلِّمُونَ الْكِتَابَ وَبِمَا كُنتُمْ تَدْرُسُونَ ٧٩

رَبَّانِيِّينَ rabbāniyyīna · worshippers of the Lord

It is not for a human [prophet] that Allāh should give him the Scripture and authority and prophethood and then he would say to the people, "Be servants to me rather than Allāh," but [instead, he would say], "Be pious scholars of the Lord because of what you have taught of the Scripture and because of what you have studied." (Surah Ali 'Imran, 3:79)

وَكَأَيِّن مِّن نَّبِيٍّ قَاتَلَ مَعَهُ رِبِّيُّونَ كَثِيرٌ فَمَا وَهَنُوا لِمَا أَصَابَهُمْ فِي سَبِيلِ اللَّهِ وَمَا ضَعُفُوا وَمَا اسْتَكَانُوا وَاللَّهُ يُحِبُّ الصَّابِرِينَ ١٤٦

رِبِّيُّونَ ribbiyyūna · (were) religious scholars

And how many a prophet [fought in battle and] with him fought many religious scholars. But they never lost assurance due to what afflicted them in the cause of Allāh, nor did they weaken or submit. And Allāh loves the steadfast. (Surah Ali 'Imran, 3:146)

حُرِّمَتْ عَلَيْكُمْ أُمَّهَاتُكُمْ وَبَنَاتُكُمْ وَأَخَوَاتُكُمْ وَعَمَّاتُكُمْ وَخَالَاتُكُمْ وَبَنَاتُ الْأَخِ وَبَنَاتُ الْأُخْتِ وَأُمَّهَاتُكُمُ اللَّاتِي أَرْضَعْنَكُمْ وَأَخَوَاتُكُم مِّنَ الرَّضَاعَةِ وَأُمَّهَاتُ نِسَائِكُمْ وَرَبَائِبُكُمُ اللَّاتِي فِي حُجُورِكُم مِّن نِّسَائِكُمُ اللَّاتِي دَخَلْتُم بِهِنَّ فَإِن لَّمْ تَكُونُوا دَخَلْتُم بِهِنَّ فَلَا جُنَاحَ عَلَيْكُمْ وَحَلَائِلُ أَبْنَائِكُمُ الَّذِينَ مِنْ أَصْلَابِكُمْ وَأَن تَجْمَعُوا بَيْنَ الْأُخْتَيْنِ إِلَّا مَا قَدْ سَلَفَ إِنَّ اللَّهَ كَانَ غَفُورًا رَّحِيمًا ٢٣

وَرَبَائِبُكُمُ warabāibukumu · and your step daughters

Prohibited to you [for marriage] are your mothers, your daughters, your sisters, your father's sisters, your mother's sisters, your brother's daughters, your sister's daughters, your [milk] mothers who nursed you, your sisters through nursing, your wives' mothers, and your step-daughters under your guardianship [born] of your wives unto whom you have gone in. But if you have not gone in unto them, there is no sin upon you. And [also prohibited are] the wives of your sons who are from your [own] loins, and that you take [in marriage] two sisters simultaneously, except for what has already occurred. Indeed, Allāh is ever Forgiving and Merciful. (Surah An-Nisa, 4:23)