The Quran root ر س و r-s-w

وَهُوَ الَّذِي مَدَّ الْأَرْضَ وَجَعَلَ فِيهَا رَوَاسِيَ وَأَنْهَارًا وَمِن كُلِّ الثَّمَرَاتِ جَعَلَ فِيهَا زَوْجَيْنِ اثْنَيْنِ يُغْشِي اللَّيْلَ النَّهَارَ إِنَّ فِي ذَٰلِكَ لَآيَاتٍ لِّقَوْمٍ يَتَفَكَّرُونَ ٣

رَوَاسِيَ rawāsiya · firm mountains

And it is He who spread the earth and placed therein firmly set mountains and rivers; and from all of the fruits He made therein two mates; He causes the night to cover the day. Indeed in that are signs for a people who give thought. (Surah Ar-Ra'd, 13:3)

وَالْأَرْضَ مَدَدْنَاهَا وَأَلْقَيْنَا فِيهَا رَوَاسِيَ وَأَنبَتْنَا فِيهَا مِن كُلِّ شَيْءٍ مَّوْزُونٍ ١٩

رَوَاسِيَ rawāsiya · firm mountains

And the earth - We have spread it and cast therein firmly set mountains and caused to grow therein [something] of every well-balanced thing. (Surah Al-Hijr, 15:19)

يَسْأَلُونَكَ عَنِ السَّاعَةِ أَيَّانَ مُرْسَاهَا قُلْ إِنَّمَا عِلْمُهَا عِندَ رَبِّي لَا يُجَلِّيهَا لِوَقْتِهَا إِلَّا هُوَ ثَقُلَتْ فِي السَّمَاوَاتِ وَالْأَرْضِ لَا تَأْتِيكُمْ إِلَّا بَغْتَةً يَسْأَلُونَكَ كَأَنَّكَ حَفِيٌّ عَنْهَا قُلْ إِنَّمَا عِلْمُهَا عِندَ اللَّهِ وَلَٰكِنَّ أَكْثَرَ النَّاسِ لَا يَعْلَمُونَ ١٨٧

مُرْسَاهَا mur'sāhā · its appointed time

They ask you, [O Muḥammad], about the Hour: when is its arrival? Say, "Its knowledge is only with my Lord. None will reveal its time except Him. It lays heavily upon the heavens and the earth. It will not come upon you except unexpectedly." They ask you as if you are familiar with it. Say, "Its knowledge is only with Allāh, but most of the people do not know." (Surah Al-A'raf, 7:187)

وَالْجِبَالَ أَرْسَاهَا ٣٢

أَرْسَاهَا arsāhā · He made them firm

And the mountains He set firmly (Surah An-Nazi'at, 79:32)