Here are some starter verses for sound doctrine in Fellowship:

Hebrews:10:24And let us consider one another to provoke unto love and to good works:
See All... [1],25 - And let us consider one another to provoke one another unto love and good works: Not forsaking the assembling of ourselves together, as the manner of some is; but exhorting one another....

Hebrews:3:13But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin.
See All... [2]

Psalm:55:14We took sweet counsel together, and walked unto the house of God in company.
See All... [3]; 119:63

Amos:3:3Can two walk together, except they be agreed?
See All... [4]

Malachi:3:16Then they that feared the LORD spake often one to another: and the LORD hearkened, and heard it, and a book of remembrance was written before him for them that feared the LORD, and that thought upon his name.
See All... [5]

Acts:1:14These all continued with one accord in prayer and supplication, with the women, and Mary the mother of Jesus, and with his brethren.
See All... [6]; 2:1, 42, 44, 45, 46, 47

Romans:1:12That is, that I may be comforted together with you by the mutual faith both of you and me.
See All... [7]

I Corinthians 1:10

Galatians:6:10As we have therefore opportunity, let us do good unto all men, especially unto them who are of the household of faith.
See All... [8]