Al-Jawāb as-Sahīh li-man baddala dīn al-Masīh - Ibn Taimiya - (3/254)

For this very reason He gathered the whole matter together in His words—Most High is He:
“ The Word of your Lord has been perfected in truth and in justice” (Q 6:115).

Likewise, He says:
“Say: If the sea were ink for [writing] my Lord’s words, the sea would run dry before my Lord’s words were exhausted, even if We brought another sea like it to replenish it” (Q 18:109).

The point of all these verses is that whatever Allah says is a firm and lasting truth that can never be undone. Thus He, Exalted is He, says:
“ The most excellent Word of your Lord was fulfilled for the Children of Israel because they persevered” (Q 7:137)—meaning that its fulfilment consisted in carrying out what He had promised them: victory over Pharaoh, his destruction, and their deliverance to al-Shām.

He also says, Most High is He:
“ The Word of your Lord has been perfected in truth and in justice” (Q 6:115),

and similarly:
“Recite what has been revealed to you from the Book of your Lord; none can alter His words” (Q 18:27).

وَلِهَذَا جَمَعَهَا فِي قَوْلِهِ - تَعَالَى -: {وَتَمَّتْ كَلِمَةُ رَبِّكَ صِدْقًا وَعَدْلًا} [الأنعام: ١١٥] . وَفِي قَوْلِهِ: {قُلْ لَوْ كَانَ الْبَحْرُ مِدَادًا لِكَلِمَاتِ رَبِّي لَنَفِدَ الْبَحْرُ قَبْلَ أَنْ تَنْفَدَ كَلِمَاتُ رَبِّي وَلَوْ جِئْنَا بِمِثْلِهِ مَدَدًا} [الكهف: ١٠٩] . فَالْمُرَادُ بِذَلِكَ أَنَّ مَا قَالَهُ اللَّهُ فَهُوَ حَقٌّ ثَابِتٌ لَا يَبْطُلُ. كَمَا قَالَ - تَعَالَى -: {وَتَمَّتْ كَلِمَةُ رَبِّكَ الْحُسْنَى عَلَى بَنِي إِسْرَائِيلَ بِمَا صَبَرُوا} [الأعراف: ١٣٧] . يَعْنِي بِتَمَامِهَا نَفَاذَ مَا وَعَدَهُمْ بِهِ مِنَ النَّصْرِ عَلَى فِرْعَوْنَ، وَإِهْلَاكِهِ، وَإِخْرَاجِهِمْ إِلَى الشَّامِ. وَقَالَ - تَعَالَى -: {وَتَمَّتْ كَلِمَةُ رَبِّكَ صِدْقًا وَعَدْلًا} [الأنعام: ١١٥] . وَمِنْهُ قَوْلُهُ: {وَاتْلُ مَا أُوحِيَ إِلَيْكَ مِنْ كِتَابِ رَبِّكَ لَا مُبَدِّلَ لِكَلِمَاتِهِ} [الكهف: ٢٧] .