Manhaj Point: Unity upon What? – Shaykh Muhammad ibn Saalih Al-‘Uthaymeen
As for uniting the Ummah, without doubt, this is obligatory. As Allaah, the Majestic and High, has said:
وَاعْتَصِمُوا بِحَبْلِ اللَّهِ جَمِيعاً وَلا تَفَرَّقُوا
And hold fast to the Rope of Allaah, altogether, and be not divided.
(Aali Imraan 3:103)

ther,” And the Rope of Allaah is His religion and His Legislation.
As for us being in agreement based upon compromise, this is an error. Due to this, we find the scholars–may Allaah have mercy upon them–refuting the innovators and deeming it to be obligatory to upon them to return to the Truth.
Translated by Raha ibn Donald Batts
Source: Silsilah Liqaa’aat Al-Baab Al-Maftooh no. 194

However, it is obligatory upon what? Upon the guidance of the Prophet (sallallaahu alayhi wa sallam) and his companions, not upon desires. Allaah said: “And hold fast to the Rope of Allaah.” He began with the Rope of Allaah before saying: جَمِيعا“…altoge