"he became the source of eternal salvation for all who obey him." Heb 5:9
Yes, look...."for all who obey him". He is the source of eternal salvation for those who obey him That's not a works salvation. The author explains in chapter 6 how it is your work, and your continuing work that
confirms that you have faith and are persevering in that faith and are, therefore, saved:
"...dear friends, we are confident of better things in your case--things that accompany salvation. God is not unjust; he will not forget your work adn the love you have shown him as you have helped his people and continue to help them. We want each of you to show this same diligence to the very end, in order to make your hope sure. We do not want you to become lazy, but to imitate those who through faith and patience (the perseverance of faith) inherit what has been promised." (Hebrews 6:9-12 NIV)
"Therefore I endure everything for the sake of the elect, that they too may obtain the salvation that is in Christ Jesus, with eternal glory." (2Tm 2:10)
Keep believing and the eternal glory is all yours. If you're hearing 'works salvation' in that, then read this verse where 'believing/trusting' is
contrasted with works, and is not among the works of the damnable works gospel:
"...to the man who does not work but trusts God who justifies the wicked, his faith is credited as righteousness." (Romans 4:5 NIV)
See? Believing /trusting in Christ is NOT a work of the damnable works gospel. In fact, it is in direct contrast to works, and is the very thing you must do to be justified, and continue to do to be saved.
Believing is not earning your salvation. Believing is the requirement for being saved.
"inheritance that can never perish, spoil or fade. This inheritance is kept in heaven for you" 1Pt 1:4
That's right, the inheritance is not what can spoil, or perish or fade. The question is, are you going to continue in the power of God
through faith and inherit the inheritance that can never perish, spoil, or fade:
"...into an inheritance that can never perish, spoil or fade--kept in heaven for you, who THROUGH FAITH are shielded by God's power until the coming of the salvation that is ready to be revealed in the last time." (1 Peter 1:4-5 NIV)