Supreme Court held as follows,

An ’obiter dictum’ as distinguished from a ratio decidendi is an observation by Court on a legal question suggested in a case before it but not arising in such manner as to require a decision. Such an obiter may not have a binding precedent as the observation was unnecessary for the decision pronounced, but even though an obiter may not have a bind effect as a precedent, but it cannot be denied that it is of considerable weight. The law which will be binding under Article 141 would, therefore, extend to all observations of points raised and decided by the Court in a given case. So far as constitutional matters are concerned, it is a practice of the Court not to make any pronouncement on points not directly raised for its decision. The decision in a judgment of the Supreme Court cannot be assailed on the ground that certain aspects were not considered or the relevant provisions were not brought to the notice of the Court (see AIR 1970 SC 1002 and AIR 1973 SC 794). When Supreme Court decides a principle it would be the duty of the High Court or a subordinate Court to follow the decision of the Supreme Court. A judgment of the High Court which refuses to follow the decision and directions of the Supreme Court or seeks to revive a decision of the High Court which had been set aside by the Supreme Court is a nullity.

Landmark Judgment of Kusum Ingots is here.

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