'Participation' in the Bible

God is faithful [He is reliable, trustworthy and ever true to His promise—He can be depended on], and through Him you were called into fellowship with His Son, Jesus Christ our Lord.

The cup of blessing which we bless, is it not a participation in the blood of Christ? The bread which we break, is it not a participation in the body of Christ?

That [careless and unworthy participation] is the reason why many among you are weak and sick, and a number sleep [in death].