Matthew 12:29ἰσχυροῦ
Or again, how can anyone enter a strong man’s house and steal his possessions, unless he first ties up the strong man? Then he can plunder his house.
Mark 3:27ἰσχυροῦ
Indeed, no one can enter a strong man’s house to steal his possessions unless he first ties up the strong man. Then he can plunder his house.
Luke 11:21ἰσχυρὸς
When a strong man, fully armed, guards his house, his possessions are secure.
1 Corinthians 1:27ἰσχυρά
But God chose the foolish things of the world to shame the wise; God chose the weak things of the world to shame the strong.
Hebrews 6:18ἰσχυρὰν
Thus by two unchangeable things in which it is impossible for God to lie, we who have fled to take hold of the hope set before us may be strongly encouraged.
Revelation 5:2ἰσχυρὸν
And I saw a mighty angel proclaiming in a loud voice, “Who is worthy to break the seals and open the scroll?”

Abbott-Smith

ἰσχυρός, -ά, -όν
(ἰσχύω), [in LXX for אֵל, גִּבּוֹר, עָצוּם, חָזַק, etc. ;]
strong, mighty, powerful;

(a) of persons, as to body or spirit: Mat.12:29, Mrk.3:27, Luk.11:21-22, 1Co.4:10 (opposite to ἀσθενής), Heb.11:34 (ἐν πολέμῳ), Rev.5:2 10:1 18:21 19:18; οἱ πλούσιοι κ. οἱ ἰ, Rev.6:15; τὰ ἰ. = oἱ ἰ. (cf. 4Ki.24:15), 1Co.1:27; of God (cf. Deu.10:17), Rev.18:8; compar., Mat.3:11, Mrk.1:7, Luk.11:22, 1Co.1:25 (τὸ ἀσθενὲς τ. θεοῦ) 1Co.10:22;

(b) of things: λιμός, Luk.15:14; ἐπιστολαί ( βαρεῖαι κ. ἰ.), 2Co.10:10; κραυγή, Heb.5:7; φωνή, Rev.18:2; παράκλησις, Heb.6:18; πόλις, Rev.18:10; βρονταί, Rev.19:6.†
(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.