Hebrews 2:13

And again, I will put my trust in him. And again, Behold, I and the children whom God hath given me.

This quotation from Isaiah 8:17ff shows the Old Testament basis for Christ's not being ashamed of his brethren, the Messianic import from the quotation being that the Messiah shall not be glorified alone, but in conjunction with his spiritual "children," synonymous with "brethren." This use of the term "children," thus making disciples to be the sons of Christ, although the term is not so used elsewhere in the New Testament, is nevertheless founded on a valid deduction from this place in Isaiah and is also supported by Isaiah 53:10 which has, "When thou shalt make his soul an offering for sin, he shall see his seed." There is also another point in the quotation, that God has given those children, which has New Testament corroboration in John 17:9, "I pray not for the world but for those whom thou hast given me."