Matthew 7:22ἐκείνῃ
Many will say to Me on that day, ‘Lord, Lord, did we not prophesy in Your name, and in Your name drive out demons and perform many miracles?’
Mark 2:20ἐκείνῃ
But the time will come when the bridegroom will be taken from them; then they will fast.
Luke 6:23ἐκείνῃ
Rejoice in that day and leap for joy, because great is your reward in heaven. For their fathers treated the prophets in the same way.
John 1:8ἐκεῖνος
He himself was not the Light, but he came to testify about the Light.
Acts 2:41ἐκείνῃ
Those who embraced his message were baptized, and about three thousand were added to the believers that day.
Hebrews 4:11ἐκείνην
Let us, therefore, make every effort to enter that rest, so that no one will fall by following the same pattern of disobedience.

Abbott-Smith

ἐκεῖνος, -η, -ο
(ἐκεῖ), [in LXX chiefly for הַהוּא ,הוּא, and cogn. forms ;]
demonstr. pron.,
that person or thing (ille), implying remoteness as compared with οὗτος (hic);

1. absol., emphatic he, she, it: opposite to οὗτος, Luk.18:14, Jas.4:15; ἡμεῖς, Heb.12:25; ὑμεῖς, Mrk.4:11; ἄλλοι, Jhn.9:9; ἐγώ, Jhn.3:30; to persons named, Mk 16:[10, 13, 20], Jhn.2:21; of one (absent) who is not named, contemptuously (Abbott, JG, §§2385, 2732), Jhn.7:11 9:28; with respect, of Christ, 1Jo.2:6 3:3, al.; referring to a preceding noun, Mrk.16:[10], Jhn.7:45; resumption of a participial subject, Jhn.1:33 9:37 10:1, Rom.14:14, al. (on its reference in Jhn.19:35, see Westc, in l.; Moffatt, Intr., 568; Sanday, Fourth Gospel, 77ff.).

2. As adj., joined, like οὗτος, to a noun with the article: Mat.7:25, Mrk.3:24, Jhn.18:15, al.; esp. of time, past or future: ἐν τ. ἡμέραις ἐ., Mat.3:1, Mrk.1:9, Act.2:18" (LXX), al.; ἐν ἐ. τ. ἡμέρᾳ, esp of the Parousia, Mat.7:22, Luk.6:23, 2Th.1:10, 2Ti.1:12; adverbially, ἐκεινής (sc. ὁδοῦ) = cl. ἐκεινῇ (Bl., §36, 13), that way, Luk.19:4.
(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.