For as yet they knew not the scripture, that he must rise again from the dead.
Berean Study Bible (BSB) - John 20:9 >For they still did not understand from the Scripture that Jesus had to rise from the dead.
Textus Receptus (TR) - John 20:9 >οὐδέπω γὰρ ᾔδεισαν τὴν γραφήν, ὅτι δεῖ αὐτὸν ἐκ νεκρῶν ἀναστῆναι.