When discord and strife are sown

“I appeal to you, brothers, to watch out for those who cause divisions and create obstacles contrary to the doctrine that you have been taught; avoid them. For such persons do not serve our Lord Christ, but their own appetites, and by smooth talk and flattery they deceive the hearts of the naive.” (Rom. 16:17-18 ESV)

Sowing discord among brothers is listed among the things God hates

“There are six things that the Lord hates, seven that are an abomination to him: haughty eyes, a lying tongue, and hands that shed innocent blood, a heart that devises wicked plans, feet that make haste to run to evil, a false witness who breathes out lies, and one who sows discord among brothers.” (Prov. 6:16-19 ESV)

Causing divisions is among the works of the fresh 

“Now the works of the flesh are evident: sexual immorality, impurity, sensuality, idolatry, sorcery, enmity, strife, jealousy, fits of anger, rivalries, dissensions, divisions, envy, drunkenness, orgies, and things like these. I warn you, as I warned you before, that those who do such things will not inherit the kingdom of God.” (Gal. 5:19-21 ESV)

“As for a person who stirs up division, after warning him once and then twice, have nothing more to do with him…” (Titus 3:10 ESV)

Therefore…

“Blessed are the peacemakers, for they shall be called sons of God.” (Matt. 5:9 ESV)

Quote:

“Satan always hates Christian fellowship; it is his policy to keep Christians apart. Anything which can divide saints from one another he delights in. He attaches far more importance to godly intercourse than we do. Since union is strength, he does his best to promote separation.” - Charles Spurgeon