Al Baqarah Ayah 143

وَكَذَٲلِكَ جَعَلْنَـٰكُمْ أُمَّةً وَسَطًا لِّتَكُونُواْ شُهَدَآءَ عَلَى ٱلنَّاسِ وَيَكُونَ ٱلرَّسُولُ عَلَيْكُمْ شَهِيدًا‌ۗ وَمَا جَعَلْنَا ٱلْقِبْلَةَ ٱلَّتِى كُنتَ عَلَيْهَآ إِلَّا لِنَعْلَمَ مَن يَتَّبِعُ ٱلرَّسُولَ مِمَّن يَنقَلِبُ عَلَىٰ عَقِبَيْهِ‌ۚ وَإِن كَانَتْ لَكَبِيرَةً إِلَّا عَلَى ٱلَّذِينَ هَدَى ٱللَّهُ‌ۗ وَمَا كَانَ ٱللَّهُ لِيُضِيعَ إِيمَـٰنَكُمْ‌ۚ إِنَّ ٱللَّهَ بِٱلنَّاسِ لَرَءُوفٌ رَّحِيمٌ ١٤٣ And so We have made you ?believers? an upright community so that you may be witnesses over humanity and that the Messenger may be a witness over you. We assigned your former direction of prayer only to distinguish those who would remain faithful to the Messenger from those who would lose faith. It was certainly a difficult test except for those ?rightly? guided by Allah. And Allah would never discount your ?previous acts of? faith. Surely Allah is Ever Gracious and Most Merciful to humanity.