#Matthew Chapter 5 Verse 8
Blessed (are) the pure in (the) heart for they God will see.
μακάριοι οἱ καθαροὶ τῇ καρδίᾳ, ὅτι αὐτοὶ τὸν θεὸν ὄψονται.
A simple straightforward verse expressing a beautiful idea.
The dative form of καρδία means no preposition ἐν is necessary in Greek.
Ὄψονται is indeed the future form of horaoo ὁραω despite its p stem.
Its one of those irregular verbs you need to learn more details of so please consult your dictionary and grammar for full details.
Ὁραω is the present but in other tenses the stem is op – οπ – or heo when the augment is added leading to ἑόρακα.
My next post for Christmas Eve will be about Luke Chapter 2 and the Angels
and there will a xmas ecard watch out for it !