Shaykh 'Abdul-'Azeez Ibn Baaz (d.1420H) - rahimahullaah - said:
"The Religion of Allaah orders to judge (with justice) in all matters and not to have walaaż (love, loyalty and allegiance) with your brother merely because he agrees with you, or to have żadaa (enmity and hatred) merely because he disagrees with you on a certain opinion or issue. This is not from justice at all! The Companions (radiyallaahu żanhum) differed in many issues, yet this did not affect the overall happiness and sincerity between them, nor their walaaż and love for each other - may Allaah be pleased with them all.
So the Believer acts upon the Shareeżah (prescribed and divine Islaamic Law) of Allaah, follows the truth, gives precedence to the evidences before anyone - yet in doing so, he does not oppress his brother, nor negate doing justice to him when he differs regarding any issue of ijtihaad (personal reasoning) in which the evidences are not so apparent. Likewise is the case for those issues in which differences occur due to different interpretations of the text. So in such instances he is excused and it is upon you to sincerely advise him and to love only the good for him and not to split-up, nor to have enmity or hatred between you and your brother - and there is no might, nor power except with Allaah."