How to treat our fellow Christian brethen in a Godly way based in the Bible?

1) We must be united in faith and in the Gospel - Philippians 1:27

2) Psalms 133:1 <> Behold, how good and how pleasant it is for brethren to dwell together in unity!

133:3 As the dew of Hermon, and as the dew that descended upon the mountains of Zion: for there the LORD commanded the blessing, even life for evermore.

Where shall be united? In the Church of God in the Bible (1 Timothy 3:15)

3) Love your neighbor as yourself - Matthew 22:37-38

4) Those who dont hate his parents, wife/husband, child/children, at his own brother/s or sister/s and even his life shall become Lord Jesus' disciple - Luke 14:26

5) Those who love his parents more than Lord Jesus shall not be worthy of Him - Matthew 10:37

6) Love the brotherhood of Christians and fear God - 1 Peter 2:17

7) It is because Love covers the multitude of sins - 1 Peter 4:8

8) Love shall remain among the Christian brethen - Hebrews 13:1

9) Love one another and by love the people will know that you are Lord Jesus' disciple - John 13:34-35

10) We must not boast our wisdom, power or riches if you are a richman, a politician or an intelligent man - Jeremiah 9:23

11) Definition of Love/Charity in the Bible: (read below)

1 Corinthians 13:4 Charity suffereth long, and is kind; charity envieth not; charity vaunteth not itself, is not puffed up,

13:5 Doth not behave itself unseemly, seeketh not her own, is not easily provoked, thinketh no evil;
 
13:6 Rejoiceth not in iniquity, but rejoiceth in the truth;

13:7 Beareth all things, believeth all things, hopeth all things, endureth all things.

12) "Put on therefore, as the elect of God, holy and beloved, bowels of mercies, kindness, humbleness of mind, meekness, longsuffering;" (Colossians 3:12)

13) "Forbearing one another, and forgiving one another, if any man have a quarrel against any: even as Christ forgave you, so also do ye." (Colossians 3:13)

Kinds of LOVE:

A) AGAPE - Brotherly love among the Christian brethen

B) EROS - Love for your own wife/husband and it is known as Conjugal Love

C) FILIA - Love of children by their parents

14) We must forgive who do wrong to you and God will forgive you if you sinned - Matthew 6:14-15

15) "Give, and it shall be given unto you; good measure, pressed down, and shaken together, and running over, shall men give into your bosom. For with the same measure that ye mete withal it shall be measured to you again." (Luke 6:38)

16) Blessed are the merciful for they will obtain mercy - Matthew 5:8

17)  1 Corinthians 6:5 I speak to your shame. Is it so, that there is not a wise man among you? no, not one that shall be able to judge between his brethren?

6:6 But brother goeth to law with brother, and that before the unbelievers.

6:7 Now therefore there is utterly a fault among you, because ye go to law one with another. Why do ye not rather take wrong? why do ye not rather suffer yourselves to be defrauded?

It means that a Christian in the same congregation must not sue his fellow brother in faith in the courts of law.

18) "Let us not therefore judge one another any more: but judge this rather, that no man put a stumblingblock or an occasion to fall in his brother's way." - Romans 14:13