Hebrews 6:8

But that which beareth thorns and briers is rejected, and is nigh unto cursing; whose end is to be burned.

That which rather (Greek, no article), 'but if it (the "land," Hebrews 6:7) bear' [ ekferousa (G1627), not so good as tiktousa (G5088)]; "bringeth forth," Hebrews 6:7; said of the good soil.

Briers, [ tribolous (G5146)] - 'thistles.'

Rejected - by God, after having been tested [ adokimos (G96)]. Reprobate. Nigh unto cursing - verging to being given up to its own barrenness by God's just curse. "Nigh" (near) softens the severity of "it is impossible," etc. (Hebrews 6:4; Hebrews 6:6). The ground is not yet actually cursed.

Whose - of which (land) the end is [ eis (G1519) kausin (G2740)] unto burning, at the last judgment. As the land of Sodom was given to "brimstone, and salt, and burning" (Deuteronomy 29:23); so as to the ungodly (Matthew 3:10; Matthew 3:12; Matthew 7:19; Matthew 13:30; John 15:6; 2 Peter 3:10). Jerusalem, which so resisted the grace of Christ, was then near unto cursing, and in a few years was "burned." Compare Matthew 22:7, an earnest of a like fate to all abusers of God's grace (Hebrews 10:26).