Hebrews 5 and 6 - Through perseverance, they will inherit the promise made to Abraham. 2018

Heb 6:12
that you may not be sluggish, but imitators of those who through faith and patience inherit the promises.

Heb 6:13
For when God made the promise to Abraham, since He could swear by no one greater, He swore by Himself,

Heb 6:14
saying, "I WILL SURELY BLESS YOU, AND I WILL SURELY MULTIPLY YOU."

They are not to be sluggish or lazy in their obedience to Elohim. He reminds them that through perseverance, they will inherit the promise made to Abraham.
The last chapter told us that we are to enter into the rest of salvation and be obedient to Yahweh and His Sabbaths (Heb. 4:9-11). The writer of Hebrews had to emphasize assembling on the Sabbath because many were not doing it (Heb. 10:24-25).

The previous chapter concludes by telling us that we have a great High Priest in heaven (Heb. 4:15-16). The beginning of this chapter tells us the requirements for high priest among men. He must be a man, for one thing.

The writer of Hebrews (probably Paul) is telling the Messianics to grow up beyond the simple basics. We saw in chapter 4 where they were told to observe the Sabbath, even though this should have been second nature to them.

In chapter 5 Paul tells the Hebrews to obey the Torah of Yahweh and to quit relying on the grace of Elohim to overcome their lack of obedience (Heb. 5:11-14).

That is the setting for chapter 6. Paul says, let us leave the "elementary principles of Messiah" and go on to maturity. Join us and see how Paul tells us to do precisely that!