Matthew Poole and continuators on Hebrews 2:12

12 Saying , I will declare thy name unto my brethren : in the midst of the church will I sing praise unto thee .

This brings in the Proof, that the great Gospel-Minister, Christ, God-Man, did call his sanctified Ones, Brethren; and was by the same Nature so related to them. The Proof is in Psalm 22.22. where the Apostle asserts, Christ spoke what was said by the Prophet there, and that this Psalm concerneth him, is evident by the Application of other Passages in it to him, both by his self and the Spirit; and who reads it, may see him crucified afresh there.

I, as the Gospel-Prophet, who have seen thee, and am of thee, Iohn. 1.18. and who only understand thy Name, will teach, and make it to be known and admired as that whereby thou art described, distinguished, and set above all other Beings and Relations to them. A Name sutable to their State and Relation unto thee and me. Thee in all thy glorious Attributes related to them as to Moses, Exod. 34.5, 6, 7. especially thy Name of Father, whereby thou standest related to me and them as Brethren, fulfilled, John 20.17. My Father and your Father, my God and your God. When he sent this Message by Mary Magdalene to his Apostles and Disciples, to whom he was related as a Brother in his Humanity, Sonship, and Heirship, Family and Houshold, and amongst whom he is the First-begotten and elder Brother. Brethren are one, and as one; and so is he and his sanctified Ones, v. 14. Luke 1.31, 35. Iohn 17.22, 23. Rom. 8.14. so v. 18.29. Gal. 4.5, 6, 7. Ephes. 3.14, 15.

In the respective Parts and Congregations of his Mystical Body, implicitely his Brethren. Christ and they are from one Father divine, he by Nature, they by Grace, and from one human Parent, Luke 3.23, 38. and both of one Flesh; he solemnly sung and praised his Father with them at his Supper, Matth. 26.30. in that representative Church, Mark 14.26.