In Isaiah 8:20, the 'testimony' from v16 is the authoritative standard — law and testimony — to consult when people deviate.

In Isaiah 29:11, the sealed book vision echoes Isaiah's command to seal the testimony — both depict prophetic words hidden from an unresponsive people.

In Daniel 12:4, the command to seal the book until the end directly parallels Isaiah's sealing of the testimony — both preserve prophecy for the future.

In Daniel 12:9, the words are closed up and sealed until the end, directly extending Isaiah's sealing of testimony into eschatology.

Matthew 13:11 states that the secrets of the kingdom are given to disciples, not to others — directly parallel to the sealed testimony for Isaiah's disciples.

Mark 4:11 says the secret of the kingdom is given to disciples, not to outsiders — a direct parallel to Isaiah's sealed testimony.

Revelation 2:17 promises hidden manna and a secret name to the conqueror — hidden revelation for the faithful, paralleling Isaiah's sealed testimony.

In Revelation 22:10, the angel reverses Isaiah's command — the prophecy must remain unsealed because the end is near.

In Daniel 9:24, 'seal both vision and prophet' uses the same sealing language for prophetic revelation as Isaiah's command.

In Revelation 10:4, John is told to seal up the thunders' words, mirroring Isaiah's command to seal the testimony for disciples.