The credit of a witness may be impeached in the following ways by the adverse party, or, with the consent of the Court, by the party who calls him: --
         (1) By the evidence of persons who testify that they, from their knowledge of the witness, believe him to be unworthy of credit;
         (2) By proof that the witness has been bribed, or has ¹[accepted] the offer of bride, or has received any other corrupt inducement to give his evidence;
         (3) By proof of former statements inconsistent with any part of his evidence which is liable to be contradicted;
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     Explanation.-- A witness declaring another witness to be unworthy of credit may not, upon his examination-in-chief, give reasons for his belief, but he may be asked his reasons in cross-examination, and the answers which he gives cannot be contradicted, though, if they are false, he may afterwards be charged with giving false evidence.
     Illustrations
     (a) A sues B for the price of goods sold and delivered to B.
     C says that he delivered the goods to B.
     Evidence is offered to show that, on a previous occasion, he said that he had not delivered goods to B. The evidence is admissible.
     (b) A is indicted for the murder of B.
     C says that B, when dying declared that A had given B the wound of which he died.
     Evidence is offered to show that, on a previous occasion, C said that the wound was not given by A or in his presence.
     The evidence is admissible.