Constitution of India, 1949
251.Directive for development of the Hindi
language.-
It shall be the duty of the Union to promote
the spread of the Hindi language, to develop it so that it may serve as a
medium of expression for all the elements of the composite culture of India and
to secure its enrichment by assimilating without interfering with its genius,
the forms, style and expressions used in Hindustani and in the other languages
of India specified in the Eighth Schedule, and by drawing, wherever necessary
or desirable, for its vocabulary, primarily on Sanskrit and secondarily on
other languages.