From Sh Fawzaan’s explanation of Sharh-us-Sunnah by Imaam al-Barbahaaree:
…as for it being said that ‘we will gather together upon what we agree about and as for what we disagree about then we’ll just pardon each other’. This is something impossible if it refers to differing in `aqeedah. However if it is differing in the matter of fiqhand matters of questions of fiqh which are possible can be this way or that way, then that may be allowable, even though even there what is still obligatory is following the evidence even in matters of fiqh. He the Most High said:
فَإِن تَنَازَعْتُمْ فِي شَيْءٍ فَرُدُّوهُ إِلَى اللّهِ وَالرَّسُولِ
So if you differ about anything then refer it back to Allaah and to the Messenger
Sooratun-Nisaa (4), aayah 59
[Translated by Abu Talhah rahimahullaah]
Listen to entire lesson here.