Yes, leaders in India are expected to abide by the Constitution of India, which is the supreme law of the country. The Constitution lays out the framework for the government, establishes fundamental rights and duties of citizens, and sets out the powers and responsibilities of different branches of government.
An example of a leader abiding by the Constitution of India would be the Prime Minister of India, who is required to take an oath of office that includes a pledge to "preserve, protect and defend the Constitution and the law." The Prime Minister is also required to act in accordance with the Constitution and to uphold the principles of democracy, secularism, and social justice. In this way, the Constitution of India serves as a guiding document for the country's leaders, ensuring that they act in the best interests of the people and the nation as a whole.