"Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil; And deliver them who through fear of death were all their lifetime subject to bondage. For verily he took not on him the nature of angels; but he took on him the seed of Abraham. Wherefore in all things it behoved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people" (Heb. 2:14-17).

Being made like His brethren did not involve a change in the eternal Spirit for God changes not (Mal. 3:6; Heb. 13:8). The Word (John 1:1) was made like unto His brethren by partaking of "...flesh and blood..." (Heb. 10:4,5), just as men "...are partakers of flesh and blood..." (Heb. 2:17; 12:9).

If Jesus’ being made like unto His brethren had also to do with His Spirit, then He would have (1) had two spirits (the Divine Spirit called the Word and a created spirit) -- which would be possession, or (2) the Word would have changed into a created spirit (which would be impossible).