Hebrews 12:24 names Jesus as mediator of a new covenant and his better blood—the 'something better' that perfects OT saints together with us.

Hebrews 12:23 mentions 'spirits of the righteous made perfect'—directly describing the OT saints whose perfection comes together with NT believers.

Hebrews 10:11-14 highlights Christ's single sacrifice perfecting forever—the means by which both OT and NT saints are made complete.

Hebrews 5:9 states Christ, made perfect, becomes source of eternal salvation—the perfection that enables the 'together' perfection of all believers.

In Hebrews 7:19, the law made nothing perfect, but a better hope is introduced, which is the 'something better' God provided for us.

In Hebrews 7:22, Jesus is the guarantor of a better covenant, identifying the 'something better' God provided for us.

In Hebrews 8:6, Christ mediates a better covenant with better promises, directly defining the 'something better' for us.

Hebrews 9:8-15 explains Christ's sacrifice cleanses and perfects, providing the new covenant that enables the 'better' perfection for all believers.

Hebrews 9:15 connects Christ's mediation to the promised inheritance, which is the 'something better' that perfects OT saints together with us.

Hebrews 9:9 shows the old system couldn't perfect the conscience, mirroring how OT saints were not made perfect without us.

In Hebrews 9:23, heavenly things are purified with better sacrifices, illustrating the 'something better' God provided for us.

Revelation 6:11 has martyrs waiting for completion until the full number of fellow servants arrives—echoing the 'together' perfection of saints.

Ephesians 3:5 reveals the mystery of Christ hidden from past generations but now disclosed—aligns with OT saints not being made perfect without NT believers.

1 Peter 1:12 directly states prophets served NT believers, not themselves – the same idea as Hebrews 11:40's 'made perfect together with us'.

Matthew 13:17 describes prophets and righteous longing to see and hear what NT believers witness—directly parallel to OT saints not being made perfect without us.

Romans 3:26 shows God justifying through faith in Jesus—the same basis on which both OT believers and we are perfected together.

Romans 3:25 presents Christ as the atoning sacrifice received by faith—the 'better' provision that allows the perfecting of saints.