LXX Gen 42:16

ἀποστείλατε ἐξ ὑμῶν ἕνα, καὶ λάβετε τὸν ἀδελΦὸ δὲ ἀπάχθητε ἕως τοῦ φανερὰ γενέσθαι τὰ ῥήματα ὑμῶν, εἰ ἅλ’ οὔ· εἰ δὲ μή, νὴ τὴν Φαραώ, εἰ μὴν κατάσκοποί ἐστε.

Send one of your number to get your brother; the rest of you will be confined so that the truth of your words may be tested. If they are untrue, then as surely as Pharaoh lives, you are spies!”