عن أبي هريرة رضي الله عنه عن النبي صلى الله عليه وسلم أنه قال: لا يلدغ المؤمن من جحر واحد مرتين (صحيح البخاري رقم 6133)

Hazrat Abu Hurairah (radhiyallahu ‘anhu) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “A believer is not bitten from the same hole twice.”

The meaning of this Hadith is that a believer is alert and exercises caution in his social and monetary dealings. If he is deceived by someone once on account of his misjudgement, then he will ensure that the mistake will not recur and he does not face the same consequence in the future.