G3588 "testament"

G3588 — ho hē to (ho hay to) ὁ ἡ τό: The masculine feminine (second) and neuter (third) forms in all their inflections; the definite article;
the (sometimes to be supplied at others omitted in English idiom): - the this that one he she it etc.

Hebrews 9 [.mp3]

²⁰Saying, This is the blood of the testament which God hath enjoined unto you.

Revelation 11 [.mp3]

¹⁹And the temple of God was opened in heaven, and there was seen in his temple the ark of his testament: and there were lightnings, and voices, and thunderings, and an earthquake, and great hail.