Let all things be done for building up

“What then, brothers? When you come together, each one has a hymn, a lesson, a revelation, a tongue, or an interpretation. Let all things be done for building up.” (1 Cor. 14:26 ESV)

Build up the body of Christ in love

“…for the equipping of the saints for the work of service, to the building up of the body of Christ;” (Eph. 4:12 NASV)

“…from whom the whole body, being fitted and held together by what every joint supplies, according to the proper working of each individual part, causes the growth of the body for the building up of itself in love.” (Eph. 4:16 NASB)

Iron sharpens iron

“Iron sharpens iron, and one man sharpens another.” (Prov. 27:17 ESV)

Therefore…

“We who are strong have an obligation to bear with the failings of the weak, and not to please ourselves. Let each of us please his neighbor for his good, to build him up. For Christ did not please himself, but as it is written, “The reproaches of those who reproached you fell on me.” For whatever was written in former days was written for our instruction, that through endurance and through the encouragement of the Scriptures we might have hope.” (Rom. 15:1-4 ESV)

“So then let us pursue what makes for peace and for mutual upbuilding.” (Rom. 14:19 ESV)

“Therefore encourage one another and build one another up, just as you are doing.” (1 Thess. 5:11 ESV)