Surat Al A`raf: (170-171)

{وَالَّذِينَ يُمَسَّكُونَ بِالْكِتَابِ وَأَقَامُواْ الصَّلاَةَ إِنَّا لاَ نُضِيعُ أَجْرَ الْمُصْلِحِينَ} [الأعراف: 170]

170- As for those who hold firm with the book of Allah and His Way, do not give up what He has commanded them, and establish the obligatory Salah which is the most important pillar of religion after the testimony of faith, We shall not waste their righteous deeds, but shall reward them for them.

{وَإِذ نَتَقْنَا الْجَبَلَ فَوْقَهُمْ كَأَنَّهُ ظُلَّةٌ وَظَنُّواْ أَنَّهُ وَاقِعٌ بِهِمْ خُذُواْ مَا آتَيْنَاكُم بِقُوَّةٍ وَاذْكُرُواْ مَا فِيهِ لَعَلَّكُمْ تَتَّقُونَ} [الأعراف: 171]

171- And remind the Jews also with the threat we had given to their ancestors by lifting the mountain above their heads as if it was like a cloud or umbrella, and they were sure that it would fall over their heads because they refused to accept the rulings of the Torah which made them scare and accepted the rulings of the Torah. Thereupon, We said to them: Take what We had given you of the Torah seriously with determination and full compliance so as to be from the righteous believers.