Strong's #2468: isthi (pronounced is'-thee)
second person imperative present of 1510; be thou:--+ agree, be, X give thyself wholly to.
Thayer's Greek Lexicon:
̓́
isthi
1) be thou
Part of Speech: verb
Relation: second person imperative present of G1510
Usage:
This word is used 5 times:
Matthew 2:13: "into Egypt, and be thou there until I bring thee word:"
Matthew 5:25: " Agree with thine adversary quickly, while thou art"
Mark 5:34: "go in peace, and be whole of thy"
Luke 19:17: "faithful in a very little, have thou authority over ten"
1 Timothy 4:15: "Meditate upon these things; give thyself wholly to them; that thy profiting"