luke 19:8 And Zacchaeus stood, and said unto the Lord; Behold, Lord, the half of my goods I give to the poor; and if I have taken any thing from any man by false accusation, I restore him fourfold. - Free Bible Online

      8-10. stood--before all.
      said unto the Lord, Behold, Lord--Mark how frequently Luke uses this title, and always where lordly authority, dignity, or power is intended.
      if I have--that is, "so far as I have," for evidently the "if" is so used (as in Php 4:8).
      taken by false accusation--defrauded, overcharged (Lu 3:12, 13).
      fourfold--The Roman law required this; the Jewish law, but the principal and a fifth more (Nu 5:7). There was no demand made for either; but, as if to revenge himself on his hitherto reigning sin (see on Joh 20:28), and to testify the change he had experienced, besides surrendering the half of his fair gains to the poor, he voluntarily determines to give up all that was ill-gotten, quadrupled. He gratefully addressed this to the "Lord," to whom he owed the wonderful change.

JFB.