who has become a priest not by a legal regulation about physical descent ¹  but by the power of an indestructible life.

On the one hand a former command is set aside ¹  because it is weak and useless, ² 

And those of the sons of Levi who receive the priestly office ¹  have authorization according to the law to collect a tithe from the people, that is, from their fellow countrymen, ²  although they too are descendants of Abraham. ³ 

For when Moses had spoken every command to all the people according to the law, he took the blood of calves and goats with water and scarlet wool and hyssop and sprinkled both the book itself and all the people,