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Article 150. Disobedience to summons issued by Congress, its committees or subcommittees, by the Constitutional Commissions, its committees, subcommittees or divisions.- The penalty of arresto mayor or a fine ranging from Forty thousand pesos (P40, 000) to Two hundred thousand pesos (P200, 000), or both such fine and imprisonment, shall be imposed upon any person who, having been duly summoned to attend as a witness before Congress, its special or standing committees and subcommittees, the Constitutional Commissions and its committees, subcommittees, or divisions, or before any commission or committee chairman or member authorized to summon witnesses, refuses, without legal excuse to obey such summons or being present before any such legislative or constitutional body or official, refuses to be sworn or placed under affirmation or to answer any legal inquiry or to produce any books, papers, documents, or records in his possession, when required by them to do so in the exercise of their functions. The same penalty shall be imposed upon any person who shall restrain another from attending as a witness, or who shall induce disobedience to summons or refusal to be sworn by any such body or official.

ACTS PUNISHABLE:
1. Disobedience w/o a legal excuse to a summons issued by the Congress or any of its committees or subcommittees;
2. Refusal of any person present before a legislative or constitutional body or official to:
(a) to be sworn or placed under affirmation;
(b) to answer any legal inquiry; or
(c) to produce books, documents, records, etc., when required to do so by the said bodies in the exercise of their functions;
3. Restraining another from attending as a witness in such a body; or
4. Inducing disobedience to a summons or refusal to be sworn.

Note:

The testimony of a person summoned must be upon matters into which the legislature has jurisdiction to inquire.