Hebrews 2:17
he had <3784> [it.]
a merciful <1655> [a merciful.]
to make atonement <1519 2433> [to make.]
Numbers 16:46-48
<06440> [from off.]
put ......... place <05414 07760> [and put.]
atonement <03722> [an atonement.]
wrath <07110> [there is wrath.]
plague ... begun <05063 02490> [the plague is begun.]
God now punished them by a secret blast, so as to put the matter beyond dispute; His hand, and His alone, was seen, not only in the plague, but in the manner in which the mortality was arrested. It was necessary that it should be done in this way, that the whole congregation might see that these men who had perished were not "the people of the Lord," and that God, not Moses and Aaron, had destroyed them.
ran <07323> [and ran.]
plague <05063> [and behold.]
placed <05414> [and he put.]
What the plague was we know not; but it seems from this to have begun at one part of the camp, and to have proceeded regularly onward.
Numbers 18:1-3
Aaron ..... sons .................. sons <0175 01121> [Aaron, Thou.]
bear ............... bear <05375> [shall bear.]
To counterbalance the high honour conferred on Aaron and his family, and to allay the fears and abate the envy of the people, it is here declared, that the priest must bear the blame of everything which was not properly conducted in the sanctuary.
join ..... minister <03867 08334> [joined unto thee.]
There is a fine paronomasia in the original. Levi is desired from {lawah,} to join, couple, associate; hence Moses says, the Levites {yillawoo,} "shall be joined," or associated, with the priests: they shall conjointly perform the sacred office, but the priests shall be principal, the Levites their associates or assistants.
minister ............ before <08334 06440> [minister.]
sons <01121> [but thou.]
near <07126> [only they.]
die <04191> [neither.]
(NT only) to listen to the NET Bible 
