Luke 1:72διαθήκης
to show mercy to our fathers and to remember His holy covenant,
Acts 3:25διαθήκης
And you are sons of the prophets and of the covenant God made with your fathers when He said to Abraham, ‘Through your offspring all the families of the earth will be blessed.’
Romans 9:4διαθῆκαι
the people of Israel. Theirs is the adoption as sons; theirs the divine glory and the covenants; theirs the giving of the law, the temple worship, and the promises.
2 Corinthians 3:6διαθήκης
And He has qualified us as ministers of a new covenant, not of the letter but of the Spirit; for the letter kills, but the Spirit gives life.
Galatians 3:17διαθήκην
What I mean is this: The law that came 430 years later does not revoke the covenant previously established by God, so as to nullify the promise.
Hebrews 7:22διαθήκης
Because of this oath, Jesus has become the guarantee of a better covenant.

Abbott-Smith

διαθήκη, -ης, ἡ
(διατίθημι), [frequently in LXX, and nearly always for בְּרִית ;]

1. as usually in cl., a disposition, testament, will (Plat., al.): Gal.3:15 (R, mg., but see Lft., in l.), Heb.9:16, 17 (R, txt.; MM, Exp., xi; Milligan, NTD, 75; Abbott, Essays, 107; Deiss., LAE, 341; but see infr.).

2. As in LXX (for בְּרִית) = cl. συνθήκη, a convention, arrangement, covenant (exc. in the disputed cases mentioned above, always between God and man, "perhaps with the feeling that the δια- compound was more suitable than the συν- for a covenant with God---συνθ. might suggest equal terms," MM, Exp., l.with): Gal.3:15 (R, txt., but see supr., and cf. Thayer, see word), Heb.9:16, 17 (R, mg., Westc., in l.; Hatch, Essays, 47; but see supr.), Mat.26:28, Mrk.14:24, Luk.1:72, Act.3:25 7:8, Rom.11:27" (LXX), 2Co.3:14, Gal.3:17, Heb.7:22 8:6, ib. 9, 10" (LXX) 9:4, 15-17 20" (LXX) 10:16 (LXX), 29 12:24 13:20, Rev.11:19; καινὴ δ., Mat.26:28, and Mrk.14:24 (R, mg.), Luk.22:20, 1Co.11:25, 2Co.3:6, Heb.8:8" (LXX) 9:15; pl. Rom.9:4, Gal.4:24, Eph.2:12.†
(AS)

Sources: Abbott-Smith’s Manual Greek Lexicon of the New Testament (1922, public domain) and glosses from STEPBible TBESG (CC BY 4.0); STEPBible TAGNT (Greek New Testament, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.