Al-Jawāb as-Sahīh li-man baddala dīn al-Masīh - Ibn Taimiya - (5/342)

“Indeed, we—the company of prophets—share one religion.”

Allah the Exalted said:

“He has ordained for you in religion what He enjoined upon Noah, and what We have revealed to you, and what We enjoined upon Abraham, Moses, and Jesus: ‘Establish the religion and do not be divided concerning it.’” ⦗Al-Shura 13⦘

He, exalted, also said:

“O Messengers, eat of the wholesome things and act righteously. I am fully aware of what you do. And truly this community of yours is one community, and I am your Lord, so be mindful of Me. Yet they split their affair among themselves into scrolls, each faction rejoicing in what it possessed.” ⦗Al-Muʾminun 51-53⦘

And He, exalted, said:

“So set your face steadfastly toward the religion as a pure monotheist—the natural disposition with which Allah created mankind. There is no altering Allah’s creation; that is the upright religion, though most people do not know. Turn back to Him, fear Him, establish prayer, and do not be among those who associate partners with Him—those who divided their religion and became sects, each party pleased with what it had.” ⦗Al-Rum 30-32⦘

As for the specific law (sharʿah) and method (minhaj), He said concerning the people of the Torah, the Gospel, and the Quran:

«إِنَّا - مَعْشَرَ الْأَنْبِيَاءِ - دِينُنَا وَاحِدٌ» ، قَالَ اللَّهُ تَعَالَى: {شَرَعَ لَكُمْ مِنَ الدِّينِ مَا وَصَّى بِهِ نُوحًا وَالَّذِي أَوْحَيْنَا إِلَيْكَ وَمَا وَصَّيْنَا بِهِ إِبْرَاهِيمَ وَمُوسَى وَعِيسَى أَنْ أَقِيمُوا الدِّينَ وَلَا تَتَفَرَّقُوا فِيهِ} [الشورى: ١٣] . وَقَالَ تَعَالَى: {يَاأَيُّهَا الرُّسُلُ كُلُوا مِنَ الطَّيِّبَاتِ وَاعْمَلُوا صَالِحًا إِنِّي بِمَا تَعْمَلُونَ عَلِيمٌ - وَإِنَّ هَذِهِ أُمَّتُكُمْ أُمَّةً وَاحِدَةً وَأَنَا رَبُّكُمْ فَاتَّقُونِ - فَتَقَطَّعُوا أَمْرَهُمْ بَيْنَهُمْ زُبُرًا كُلُّ حِزْبٍ بِمَا لَدَيْهِمْ فَرِحُونَ} [المؤمنون: ٥١ - ٥٣] . وَقَالَ تَعَالَى: {فَأَقِمْ وَجْهَكَ لِلدِّينِ حَنِيفًا فِطْرَةَ اللَّهِ الَّتِي فَطَرَ النَّاسَ عَلَيْهَا لَا تَبْدِيلَ لِخَلْقِ اللَّهِ ذَلِكَ الدِّينُ الْقَيِّمُ وَلَكِنَّ أَكْثَرَ النَّاسِ لَا يَعْلَمُونَ - مُنِيبِينَ إِلَيْهِ وَاتَّقُوهُ وَأَقِيمُوا الصَّلَاةَ وَلَا تَكُونُوا مِنَ الْمُشْرِكِينَ - مِنَ الَّذِينَ فَرَّقُوا دِينَهُمْ وَكَانُوا شِيَعًا كُلُّ حِزْبٍ بِمَا لَدَيْهِمْ فَرِحُونَ} [الروم: ٣٠ - ٣٢] . وَأَمَّا الشِّرْعَةُ وَالْمِنْهَاجُ، فَقَدْ قَالَ عَنْ أَهْلِ التَّوْرَاةِ وَالْإِنْجِيلِ وَالْقُرْآنِ: