Rather,
ἀλλὰ (alla)
Conjunction
Strong's Greek 235: But, except, however. Neuter plural of allos; properly, other things, i.e. contrariwise.

as
καθὼς (kathōs)
Adverb
Strong's Greek 2531: According to the manner in which, in the degree that, just as, as. From kata and hos; just as, that.

it is written:
γέγραπται (gegraptai)
Verb - Perfect Indicative Middle or Passive - 3rd Person Singular
Strong's Greek 1125: A primary verb; to 'grave', especially to write; figuratively, to describe.

“Those who
οἷς (hois)
Personal / Relative Pronoun - Dative Masculine Plural
Strong's Greek 3739: Who, which, what, that.

were not told
ἀνηγγέλη (anēngelē)
Verb - Aorist Indicative Passive - 3rd Person Singular
Strong's Greek 312: To bring back word, report; I announce, declare. From ana and the base of aggelos; to announce.

about
περὶ (peri)
Preposition
Strong's Greek 4012: From the base of peran; properly, through, i.e. Around; figuratively with respect to; used in various applications, of place, cause or time.

Him
αὐτοῦ (autou)
Personal / Possessive Pronoun - Genitive Masculine 3rd Person Singular
Strong's Greek 846: He, she, it, they, them, same. From the particle au; the reflexive pronoun self, used of the third person, and of the other persons.

will see,
Ὄψονται (Opsontai)
Verb - Future Indicative Middle - 3rd Person Plural
Strong's Greek 3708: Properly, to stare at, i.e. to discern clearly; by extension, to attend to; by Hebraism, to experience; passively, to appear.

and
καὶ (kai)
Conjunction
Strong's Greek 2532: And, even, also, namely.

those who
οἳ (hoi)
Personal / Relative Pronoun - Nominative Masculine Plural
Strong's Greek 3739: Who, which, what, that.

have not heard
ἀκηκόασιν (akēkoasin)
Verb - Perfect Indicative Active - 3rd Person Plural
Strong's Greek 191: To hear, listen, comprehend by hearing; pass: is heard, reported. A primary verb; to hear.

will understand.”
συνήσουσιν (synēsousin)
Verb - Future Indicative Active - 3rd Person Plural
Strong's Greek 4920: To consider, understand, perceive. From sun and hiemi; to put together, i.e. to comprehend; by implication, to act piously.


Additional Translations
Rather, as it is written: “Those who were not told about Him will see, and those who have not heard will understand.”

Rather, as it has been written: "They will see, to whom it was not proclaimed concerning Him; and those who have not heard will understand."

But as it is written, To whom he was not spoken of, they shall see: and they that have not heard shall understand.

but, as it is written, They shall see, to whom no tidings of him came, And they who have not heard shall understand.

but according as it is written, To whom there was nothing told concerning him, they shall see; and they that have not heard shall understand.

but, as it is written, They shall see, to whom no tidings of him came, And they who have not heard shall understand.

But as it is written, They shall see to whom he was not spoken of: and they that have not heard shall understand.

But, as Scripture says, "Those shall see, to whom no report about Him has hitherto come, and those who until now have not heard shall understand."

But, as it is written, "They will see, to whom no news of him came. They who haven't heard will understand."

but according as it hath been written, 'To whom it was not told concerning him, they shall see; and they who have not heard, shall understand.' Ears Heard Hitherto Holy News Rather Report Scripture Tidings Understand Writings Written Ears Heard Hitherto Holy News Rather Report Scripture Tidings Understand Writings Written Romans 15:21 NIV
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Alphabetical: about and as but had have heard him is it news no not of Rather see shall They Those told understand were who will written

NT Letters: Romans 15:21 But as it is written They will (Rom. Ro) Bible Study Resources, Dictionary, Concordance and Search Tools