Some translations set each line of poetry farther to the right than the rest of the text to make it easier to read. The ULB does this with the poetry in 7:17, 21, which are words from the Old Testament.
Only a high priest could offer sacrifices so that God could forgive sins, so Jesus had to be a high priest. The law of Moses commanded that the high priest be from the tribe of Levi, but Jesus was from the tribe of Judah. God made him a priest like the priest Melchizedek, who lived at the time of Abraham, before there was a tribe of Levi.
See in Reader
