Hebrews 5:9

5:9 And by being perfected in this way, he became the source of eternal salvation to all who obey him,

Hebrews 10:14

10:14 For by one offering he has perfected for all time those who are made holy.

Hebrews 11:40

11:40 For God had provided something better for us, so that they would be made perfect together with us. ¹ 

[11:40]  ¹ tn The Greek phrasing emphasizes this point by negating the opposite: “so that they would not be made perfect without us.”