Allah, the Most High, said:

وَلَقَدْ بَوَّأْنَا بَنِي إِسْرَائِيلَ مُبَوَّأَ صِدْقٍ وَرَزَقْنَاهُم مِّنَ الطَّيِّبَاتِ فَمَا اخْتَلَفُوا حَتَّىٰ جَاءَهُمُ الْعِلْمُ ۚ إِنَّ رَبَّكَ يَقْضِي بَيْنَهُمْ يَوْمَ الْقِيَامَةِ فِيمَا كَانُوا فِيهِ يَخْتَلِفُونَ

“And We had certainly settled the Children of Israel in an honourable dwelling place and provided them with good things. And they did not differ until [after] knowledge had come to them. Indeed, your Lord will judge between them on the Day of Resurrection concerning that over which they used to differ.” (Surah Yunus 10:93)

Shaykh Abdul-Rahman ibn Nasir al-Saʿdi (rahimahullah) said:

“This [differing and disunity] is the sickness that afflicts the people of sound religion: when Shaytan fails to make them obey him by abandoning the religion entirely, he strives instead to stir up resentment between them, and to cast enmity and hatred among them. This differing leads to more of it; then they begin declaring one another misguided and showing hostility towards one another, this is something that greatly pleases the accursed Shaytan.

Yet when their Lord is One, their Messenger is one, their religion is one, and their common interests are united — what then is the reason for them to differ in a way that shatters their unity, scatters their affairs, dissolves their bond and their order, causing them to lose so much of their religious and worldly interests, and for parts of their religion to die as a result?!

So we ask You, O Allah, to show gentleness to Your believing servants: unite their ranks, mend their rifts, and bring back those who are distant to those who are near. O Possessor of Majesty and Honour.”

Source: Tafsir al-Sa‘di, Surah Yunus, Verse 93.

Note: This addresses the sad state of affairs among the people of ‘sound religion’, the People of Sunnah and Truth, who sometimes fall into internal disputes and disagreements. This is something encouraged by Shaytan and must be avoided.

As for the People of Truth differing with the People of Falsehood, then this is necessary: they must strive to rectify them and call them to follow the truth. If they persist upon their falsehood, they are to be treated with enmity, declared misguided, and the People of Truth must distance themselves from them.