- Original: ἴσθι - Transliteration: Isthi - Phonetic: is'-thee - Definition: 1. be thou - Origin: second person imperative present of G1510 - TDNT entry: None - Part(s) of speech: Verb - Strong's: Second person imperative present of G1510 ; be thou: - + agree be X give thyself wholly to. Total KJV Occurrences: 2 • be, 1 Mat 2:13 • wholly, 1 1 Timothy 4:15