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ἰδού

2nd Sg Aor Mid Impv ὁράω ’to see’ (The aorist stem of ὁράω is ἰδ- (cf. εἶδον = ’I saw’; it later became frozen as an indcl. part. meaning “look!” or “behold”)

ἂν

(modal part.) used with Verbs to indicate that the action is limited by circumstances or defined by conditions. LJS: https://logeion.uchicago.edu/%E1%BC%84%CE%BD