Thayer's Greek Lexicon

 1. have
  1) to hold back, keep off, prevent
  2) to have wholly or in full, to have received
  3) it is enough, sufficient
2. to be away, absent, distant
3. to hold one's self off, abstain

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"have" in Mat. 6.2, is modified with a prefix which changes its
meaning to "have in full" and was commonly used on business receipts
to mean "paid in full". No payment or service was expected to follow
the close of the transaction.