Brothers,
Ἀδελφοί (Adelphoi)
Noun - Vocative Masculine Plural
Strong's Greek 80: A brother, member of the same religious community, especially a fellow-Christian. A brother near or remote.

let me put this
λέγω (legō)
Verb - Present Indicative Active - 1st Person Singular
Strong's Greek 3004: (a) I say, speak; I mean, mention, tell, (b) I call, name, especially in the pass., (c) I tell, command.

in human terms.
κατὰ (kata)
Preposition
Strong's Greek 2596: A primary particle; down, in varied relations (genitive, dative or accusative) with which it is joined).

Even
ὅμως (homōs)
Conjunction
Strong's Greek 3676: Yet, nevertheless, even. Adverb from the base of homou; at the same time, i.e. notwithstanding, yet still.

a human covenant,
διαθήκην (diathēkēn)
Noun - Accusative Feminine Singular
Strong's Greek 1242: From diatithemai; properly, a disposition, i.e. a contract.

once it is ratified,
κεκυρωμένην (kekyrōmenēn)
Verb - Perfect Participle Middle or Passive - Accusative Feminine Singular
Strong's Greek 2964: To ratify, confirm, make valid, reaffirm, assure. From the same as kurios; to make authoritative, i.e. Ratify.

cannot
οὐδεὶς (oudeis)
Adjective - Nominative Masculine Singular
Strong's Greek 3762: No one, none, nothing.

be canceled
ἀθετεῖ (athetei)
Verb - Present Indicative Active - 3rd Person Singular
Strong's Greek 114: From a compound of a and a derivative of tithemi; to set aside, i.e. to disesteem, neutralize or violate.

or
ἢ (ē)
Conjunction
Strong's Greek 2228: Or, than. A primary particle of distinction between two connected terms; disjunctive, or; comparative, than.

amended.
ἐπιδιατάσσεται (epidiatassetai)
Verb - Present Indicative Middle or Passive - 3rd Person Singular
Strong's Greek 1928: To make an additional testamentary disposition, To furnish with additions.


Additional Translations
Brothers, let me put this in human terms. Even a human covenant, once it is ratified, cannot be canceled or amended.

Brothers, I am speaking according to man. No one sets aside or adds thereto a covenant even of man, having been ratified.

Brothers, I speak after the manner of men; Though it be but a man's covenant, yet if it be confirmed, no man cancels, or adds thereto.

Brethren, I speak after the manner of men: Though it be but a man's covenant, yet when it hath been confirmed, no one maketh it void, or addeth thereto.

Brethren, (I speak according to man,) even man's confirmed covenant no one sets aside, or adds other dispositions to.

Brethren, I speak after the manner of men: Though it be but a man's covenant, yet when it hath been confirmed, no one maketh it void, or addeth thereto.

Brethren, I speak after the manner of men; Though it is but a man's covenant, yet if it is confirmed, no man disannulleth or addeth to it.

Brethren, even a covenant made by a man--to borrow an illustration from daily life--when once formally sanctioned is not liable to be set aside or added to.

Brothers, speaking of human terms, though it is only a man's covenant, yet when it has been confirmed, no one makes it void, or adds to it.

Brethren, as a man I say it, even of man a confirmed covenant no one doth make void or doth add to,Added Addeth Adds Annuls Borrow Case Conditions Confirmed Covenant Daily Established Example Formally Human Illustration Life Makes Maketh Manner Once Ratified Relations Sanctioned Sets Speak Speaking Terms Thereto VoidAdded Addeth Adds Annuls Borrow Case Conditions Confirmed Covenant Daily Established Example Formally Human Illustration Life Makes Maketh Manner Once Ratified Relations Sanctioned Sets Speak Speaking Terms Thereto VoidGalatians 3:15 NIV
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Alphabetical: a add adds an as aside been Brethren Brothers can case conditions covenant duly established even everyday example from has human I in is it Just let life man's me no of one only or ratified relations set sets so speak take terms that this though to when yet

NT Letters: Galatians 3:15 Brothers speaking of human terms though it (Gal. Ga) Bible Study Resources, Dictionary, Concordance and Search Tools