Berean Study Bible (BSB) - Mark 9:6 >

For they were all so terrified that Peter did not know what else to say.

Textus Receptus (TR) - Mark 9:6 >

Οὐ γὰρ ᾔδει τί λαλήσῃ· ἦσαν γὰρ ἔκφοβοι.