Colossians 1:18, 24

He is also the head [the life-source and leader] of the body, the church; and He is the beginning, the firstborn from the dead, so that He Himself will occupy the first place [He will stand supreme and be preeminent] in everything. [1 Cor 15:20]

Now I rejoice in my sufferings on your behalf. And with my own body I supplement whatever is lacking [on our part] of Christ’s afflictions, on behalf of His body, which is the church.