Matthew 26:58ἔσω
But Peter followed Him at a distance, right up to the courtyard of the high priest. And he went in and sat down with the guards to see the outcome.
Mark 14:54ἔσω
Peter followed Him at a distance, right into the courtyard of the high priest. And he sat with the officers and warmed himself by the fire.
John 20:26ἔσω
Eight days later, His disciples were once again inside with the doors locked, and Thomas was with them. Jesus came and stood among them and said, “Peace be with you.”
Acts 5:23ἔσω
“We found the jail securely locked, with the guards posted at the doors; but when we opened them, we found no one inside.”
Romans 7:22ἔσω
For in my inner being I delight in God’s law.
1 Corinthians 5:12ἔσω
What business of mine is it to judge those outside the church? Are you not to judge those inside?

Abbott-Smith

ἔσω Ion, and old Att.. form of εἴσω
(εἰς),
adv., [in LXX for etc. ;]

1. prop., after verbs of motion (to) within, into: Mat.26:58, Mrk.14:54; with genitive, Mrk.15:16.

2. As frequently in cl. (= cl. ἔνδον), after verbs of rest, within: Jhn.20:26, Act.5:23; οἱ ἔ. (opposite to οἱ ἔξω), 1Co.5:12; ὁ ἔ. ἄνθρωπος, Rom.7:22, 2Co.4:16, Eph.3:16.†
(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.