The Indian Contract Act, 1872
197. Ratification may be expressed or implied –
Ratification may be expressed or may be implied in the conduct of the person on whose behalf the acts are done.
(a) A, without authority, buys goods for B. Afterwards B sells them to C on his own account; B’s conduct implies a ratification of the purchase made for him by A.
(b) A, without B’s authority, lends B’s money to C. Afterwards B accepts interest on the money from C. B’s conduct implies a ratification of the loan.