Surat An-Nahl (101-102)

{وَإِذَا بَدَّلْنَا آيَةً مَّكَانَ آيَةٍ وَاللّهُ أَعْلَمُ بِمَا يُنَزِّلُ قَالُواْ إِنَّمَا أَنتَ مُفْتَرٍ بَلْ أَكْثَرُهُمْ لاَ يَعْلَمُونَ} (النحل : 101)

101- When we revealed an Ayah from the Qur'an in place of another as an abrogation to it, and Allah knows what is suitable for His Creation, polytheists said to the Messenger of Allah (peace be upon him): You are a liar because you command your Companions with something then forbid them to do it; this is not the Lord's speech, this is yours. Most infidels are ignorant, therefore they do not know the essence of replacing rulings to facilitate matters for His Servants.

{قُلْ نَزَّلَهُ رُوحُ الْقُدُسِ مِن رَّبِّكَ بِالْحَقِّ لِيُثَبِّتَ الَّذِينَ آمَنُواْ وَهُدًى وَبُشْرَى لِلْمُسْلِمِينَ} (النحل : 102)

102- O Prophet, say to them: Gabriel came down with the Qur'an from Allah with truthfulness and justice to make the hearts of believers firm and to increase their faith, assure their hearts, and to be a guide to them to the truth, giving glad tidings with success and victory.