Genesis 44:8

Behold, the money— Joseph's brethren urge, as a good proof of their honesty, and of the improbability of the charge laid against them, that it could never be supposed that they, who so faithfully restored the money found in their sacks, which they might so easily have concealed, would scandalously pilfer what was of so much less value, and which might be so easily discovered. Conscious of their innocence, they make the most confident, though incautious proposal; for, having been so strangely deceived with respect to the money found in their sacks, they ought to have been slower, at least, in the present case; see Genesis 44:9.