Adam Clarke on Luke 16:6

A hundred measures of oil - Ἑκατον βατους, A hundred baths. The בת bath was the largest measure of capacity among the Hebrews, except the homer, of which it was the tenth part: see Eze 45:11, Eze 45:14. It is equal to the ephah, i.e. to seven gallons and a half of our measure.

Take thy bill - Thy account - το γραμμα. The writing in which the debt was specified, together with the obligation to pay so much, at such and such times. This appears to have been in the hand-writing of the debtor, and probably signed by the steward: and this precluded imposition on each part. To prevent all appearance of forgery in this case, he is desired to write it over again, and to cancel the old engagement. In carrying on a running account with a tradesman, it is common among the Hindoos for the buyer to receive from the hands of the seller a daily account of the things received; and according to this account, written on a slip of paper, and which remains in the hands of the buyer, the person is paid.